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/misc/smartcardManager.js

@@ -111,6 +111,5 @@ var SmartcardManager = class {
 
         return true;
     }
-
 };
 Signals.addSignalMethods(SmartcardManager.prototype);