Improve and fix bugs surrounding reactions (#24760)

- Slightly decrease size of reaction buttons
- Remove tooltip inside menu, it's obvious by the picture alone
- Fix top menu triangle
- Use `display: grid` to align icons in menu
- Use regular tooltip for reaction users
- Fix bug that deleted the reaction bar on clicking already reacted
reaction in dropdown

<img width="490" alt="Screenshot 2023-05-17 at 00 03 42"
src="61588b37-facb-4829-b75b-e1cb5dda8ca4">

<img width="67" alt="Screenshot 2023-05-17 at 00 11 14"
src="29605589-3b5f-40c6-8ad4-09923094bb8e">

<img width="211" alt="Screenshot 2023-05-17 at 00 29 30"
src="7d2725da-6a3d-4e42-a351-53647f79f762">
<img width="210" alt="Screenshot 2023-05-17 at 00 29 54"
src="b50f8364-033c-4445-ba25-61a814bb2d92">


<img width="892" alt="Screenshot 2023-05-17 at 00 12 20"
src="30a46424-406a-46e5-b4de-47172eb8679d">

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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

web_src/js/features/repo-legacy.js

@@ -544,7 +544,7 @@ export function initRepository() {
     initRepoIssueDependencyDelete();
     initRepoIssueCodeCommentCancel();
     initRepoPullRequestUpdate();
-    initCompReactionSelector();
+    initCompReactionSelector($(document));
 
     initRepoPullRequestMergeForm();
   }