LibGUI: Set a tooltip on the emojis' buttons to their code point names

Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/21a89b65fc
Pull-request: https://github.com/SerenityOS/serenity/pull/15094
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibGUI/EmojiInputDialog.cpp

@@ -90,6 +90,9 @@ auto EmojiInputDialog::supported_emoji() -> Vector<Emoji>
             done(ExecResult::OK);
         };
 
+        if (name.has_value())
+            button->set_tooltip(name->to_titlecase());
+
         code_points.empend(code_point, move(name), move(button));
     }