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/code-frequency.js

@@ -11,7 +11,7 @@ export async function initRepoCodeFrequency() {
         loadingTitle: el.getAttribute('data-locale-loading-title'),
         loadingTitleFailed: el.getAttribute('data-locale-loading-title-failed'),
         loadingInfo: el.getAttribute('data-locale-loading-info'),
-      }
+      },
     });
     View.mount(el);
   } catch (err) {