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="https://github.com/go-gitea/gitea/assets/115237/61588b37-facb-4829-b75b-e1cb5dda8ca4">

<img width="67" alt="Screenshot 2023-05-17 at 00 11 14"
src="https://github.com/go-gitea/gitea/assets/115237/29605589-3b5f-40c6-8ad4-09923094bb8e">

<img width="211" alt="Screenshot 2023-05-17 at 00 29 30"
src="https://github.com/go-gitea/gitea/assets/115237/7d2725da-6a3d-4e42-a351-53647f79f762">
<img width="210" alt="Screenshot 2023-05-17 at 00 29 54"
src="https://github.com/go-gitea/gitea/assets/115237/b50f8364-033c-4445-ba25-61a814bb2d92">


<img width="892" alt="Screenshot 2023-05-17 at 00 12 20"
src="https://github.com/go-gitea/gitea/assets/115237/30a46424-406a-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-issue-content.js

@@ -76,7 +76,7 @@ function showContentHistoryMenu(issueBaseUrl, $item, commentId) {
   const $headerLeft = $item.find('.comment-header-left');
   const menuHtml = `
   <div class="ui pointing dropdown top left content-history-menu" data-comment-id="${commentId}">
-    &bull; <a>${i18nTextEdited}${svg('octicon-triangle-down', 14, 'dropdown icon gt-ml-1 gt-mt-1')}</a>
+    &bull; <a class="muted">${i18nTextEdited}${svg('octicon-triangle-down', 14, 'dropdown icon gt-ml-1 gt-mt-1')}</a>
     <div class="menu">
     </div>
   </div>`;