Fix help native ad button style

Author: MihaiCristianCondrea

app/src/main/res/layout/ad_help.xml

@@ -60,7 +60,7 @@
 
                 <com.google.android.material.button.MaterialButton
                     android:id="@+id/ad_call_to_action"
-                    style="@style/Widget.Material3.Button.FilledTonalButton"
+                    style="@style/Widget.Material3.Button.TonalButton"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:layout_marginStart="12dp"