cleanup: Remove spaces in object literals

We only adopted this style relatively recently, so there's a bit
more to adjust. Still, it's manageable and another step towards
getting rid of the legacy style.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2866>

js/dbusServices/dbusService.js

@@ -136,7 +136,7 @@ export class ServiceImplementation {
     }
 
     _injectTracking(methodName) {
-        const { prototype } = Gio.DBusMethodInvocation;
+        const {prototype} = Gio.DBusMethodInvocation;
         const origMethod = prototype[methodName];
         const that = this;