refactor: Fix a bunch of minor things (#5094)

src/messages/Emote.hpp

@@ -16,7 +16,7 @@ struct Emote {
     ImageSet images;
     Tooltip tooltip;
     Url homePage;
-    bool zeroWidth;
+    bool zeroWidth{};
     EmoteId id;
     EmoteAuthor author;
     /**

src/messages/SharedMessageBuilder.hpp

@@ -54,6 +54,7 @@ protected:
 
     virtual Outcome tryAppendEmote(const EmoteName &name)
     {
+        (void)name;
         return Failure;
     }