Scoped labels: don't require holding alt key to remove

Alt doesn't work on all browsers, the simplest solution for v1.19 is to just
not require it and toggle the label by just clicking.

Part of go-gitea#22974

web_src/js/features/repo-legacy.js

@@ -145,19 +145,14 @@ export function initRepoCommentForm() {
 
       const clickedItem = $(this);
       const scope = $(this).attr('data-scope');
-      const canRemoveScope = e.altKey;
 
       $(this).parent().find('.item').each(function () {
         if (scope) {
           // Enable only clicked item for scoped labels
           if ($(this).attr('data-scope') !== scope) {
             return true;
           }
-          if ($(this).is(clickedItem)) {
-            if (!canRemoveScope && $(this).hasClass('checked')) {
-              return true;
-            }
-          } else if (!$(this).hasClass('checked')) {
+          if (!$(this).is(clickedItem) && !$(this).hasClass('checked')) {
             return true;
           }
         } else if (!$(this).is(clickedItem)) {