Enforce trailing comma in JS on multiline (#30002)

To keep blame info accurate and to avoid [changes like
this](https://github.com/go-gitea/gitea/pull/29977/files#diff-c3422631a14edbe1e508c4b22f0c718db318be08a6e889427802f9b6165d88d6R359),
it's good to always have a trailing comma, so let's enforce it in JS.

This rule is completely automatically fixable with `make lint-js-fix`
and that's what I did here.

web_src/js/features/repo-wiki.js

@@ -60,7 +60,7 @@ async function initRepoWikiFormEditor() {
         'gitea-code-inline', 'code', 'quote', '|', 'gitea-checkbox-empty', 'gitea-checkbox-checked', '|',
         'unordered-list', 'ordered-list', '|',
         'link', 'image', 'table', 'horizontal-rule', '|',
-        'preview', 'fullscreen', 'side-by-side', '|', 'gitea-switch-to-textarea'
+        'preview', 'fullscreen', 'side-by-side', '|', 'gitea-switch-to-textarea',
       ],
     },
   });