Reduce emoji size (go-gitea#12317)

* Reduce emoji size

Rendering should now pretty much match GitHub with 1.25em. I verified
that emojis don't increase the line height and removed unecessary size
overrides because now all emojis should appear similar in relation to
the font size.

* fix reaction hover

Author: silverwind

web_src/less/_base.less

@@ -1271,33 +1271,18 @@ i.icon.centerlock {
 
 .emoji,
 .reaction {
-    font-size: 1.5em;
-    line-height: 1.2;
+    font-size: 1.25em;
+    line-height: 1;
     font-style: normal !important;
     font-weight: normal !important;
-    vertical-align: middle;
-}
-
-#issue-title > .emoji {
-    font-size: 1em;
-}
-
-.commit-summary > .emoji {
-    font-size: 1em;
-}
-
-.label > .emoji {
-    font-size: 1em;
+    vertical-align: -.075em;
 }
 
-.dropdown .emoji {
-    font-size: 1em;
-}
 .emoji img,
 .reaction img {
     border-width: 0 !important;
     margin: 0 !important;
     width: 1em !important;
     height: 1em !important;
-    vertical-align: middle !important;
+    vertical-align: -.15em;
 }

web_src/less/_repository.less

@@ -2246,7 +2246,7 @@
         .select-reaction {
             display: flex;
             align-items: center;
-            padding: .5rem;
+            padding: 0 .5rem;
 
             &:not(.active) a {
                 display: none;