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/components/ScopedAccessTokenSelector.vue

@@ -39,7 +39,7 @@ const sfc = {
         'repository',
         'user');
       return categories;
-    }
+    },
   },
 
   mounted() {
@@ -68,7 +68,7 @@ const sfc = {
       }
       // no scopes selected, show validation error
       showElem(warningEl);
-    }
+    },
   },
 };