cleanup: Remove empty leading/trailing lines in blocks

gjs added a new rule to its eslint ruleset that forbids "block padding",
so make sure we conform to that rule before syncing up the configuration.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1498

js/ui/messageList.js

@@ -291,7 +291,6 @@ var LabelExpanderLayout = GObject.registerClass({
             if (child.visible)
                 child.allocate(box);
         }
-
     }
 });