qt: make console buttons look clickable

Change the type for the console's buttons to QToolButton which will make them look explicitly clickable, which in turn fixes the small hitbox issue for macOS.
With this change, we need to generalize the respective action connect logic from QPushButton to QAbstractButton.
While here, update width and height of icon for consistency with other tool buttons.

Author: jarolrod

src/qt/forms/debugwindow.ui

@@ -470,13 +470,7 @@
           </spacer>
          </item>
          <item>
-          <widget class="QPushButton" name="fontSmallerButton">
-           <property name="maximumSize">
-            <size>
-             <width>24</width>
-             <height>24</height>
-            </size>
-           </property>
+          <widget class="QToolButton" name="fontSmallerButton">
            <property name="toolTip">
             <string>Decrease font size</string>
            </property>
@@ -489,26 +483,14 @@
            </property>
            <property name="iconSize">
             <size>
-             <width>24</width>
-             <height>16</height>
+             <width>22</width>
+             <height>22</height>
             </size>
            </property>
-           <property name="autoDefault">
-            <bool>false</bool>
-           </property>
-           <property name="flat">
-            <bool>true</bool>
-           </property>
           </widget>
          </item>
          <item>
-          <widget class="QPushButton" name="fontBiggerButton">
-           <property name="maximumSize">
-            <size>
-             <width>24</width>
-             <height>24</height>
-            </size>
-           </property>
+          <widget class="QToolButton" name="fontBiggerButton">
            <property name="toolTip">
             <string>Increase font size</string>
            </property>
@@ -521,26 +503,14 @@
            </property>
            <property name="iconSize">
             <size>
-             <width>24</width>
-             <height>16</height>
+             <width>22</width>
+             <height>22</height>
             </size>
            </property>
-           <property name="autoDefault">
-            <bool>false</bool>
-           </property>
-           <property name="flat">
-            <bool>true</bool>
-           </property>
           </widget>
          </item>
          <item>
-          <widget class="QPushButton" name="clearButton">
-           <property name="maximumSize">
-            <size>
-             <width>24</width>
-             <height>24</height>
-            </size>
-           </property>
+          <widget class="QToolButton" name="clearButton">
            <property name="toolTip">
             <string>Clear console</string>
            </property>
@@ -554,15 +524,15 @@
             <iconset resource="../bitcoin.qrc">
              <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
            </property>
+           <property name="iconSize">
+            <size>
+             <width>22</width>
+             <height>22</height>
+            </size>
+           </property>
            <property name="shortcut">
             <string notr="true">Ctrl+L</string>
            </property>
-           <property name="autoDefault">
-            <bool>false</bool>
-           </property>
-           <property name="flat">
-            <bool>true</bool>
-           </property>
           </widget>
          </item>
         </layout>

src/qt/rpcconsole.cpp

@@ -34,6 +34,7 @@
 #include <wallet/wallet.h>
 #endif
 
+#include <QAbstractButton>
 #include <QDateTime>
 #include <QFont>
 #include <QKeyEvent>
@@ -503,9 +504,9 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
     ui->lineEdit->setMaxLength(16 * 1024 * 1024);
     ui->messagesWidget->installEventFilter(this);
 
-    connect(ui->clearButton, &QPushButton::clicked, [this] { clear(); });
-    connect(ui->fontBiggerButton, &QPushButton::clicked, this, &RPCConsole::fontBigger);
-    connect(ui->fontSmallerButton, &QPushButton::clicked, this, &RPCConsole::fontSmaller);
+    connect(ui->clearButton, &QAbstractButton::clicked, [this] { clear(); });
+    connect(ui->fontBiggerButton, &QAbstractButton::clicked, this, &RPCConsole::fontBigger);
+    connect(ui->fontSmallerButton, &QAbstractButton::clicked, this, &RPCConsole::fontSmaller);
     connect(ui->btnClearTrafficGraph, &QPushButton::clicked, ui->trafficGraph, &TrafficGraphWidget::clear);
 
     // disable the wallet selector by default