js: Use async D-Bus wrappers

After porting the more complex cases - in particular those that
affect a module's API - we are left with straight-forward D-Bus
method calls that can be moved to promise-based wrappers in one
go.

For consistency, this also switches from Remote to Async where
the call result is ignored.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2344>

js/ui/windowManager.js

@@ -894,8 +894,8 @@ var WindowManager = class {
                 labels.push(str ?? '');
             }
 
-            if (this._gsdWacomProxy)
-                this._gsdWacomProxy.SetOLEDLabelsRemote(pad.get_device_node(), labels);
+            this._gsdWacomProxy?.SetOLEDLabelsAsync(
+                pad.get_device_node(), labels).catch(logError);
         });
 
         global.display.connect('init-xserver', (display, task) => {