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/modules/tippy.js

@@ -148,7 +148,7 @@ export function initGlobalTooltips() {
   const observerConnect = (observer) => observer.observe(document, {
     subtree: true,
     childList: true,
-    attributeFilter: ['data-tooltip-content', 'title']
+    attributeFilter: ['data-tooltip-content', 'title'],
   });
   const observer = new MutationObserver((mutationList, observer) => {
     const pending = observer.takeRecords();