status/power: Always sync after creating proxy

Otherwise the menu remains in an inconsistent state in case of an
error, until something else triggers a call to _sync() (like a
settings change).

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4431

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1901>

js/ui/status/power.js

@@ -40,10 +40,10 @@ class Indicator extends PanelMenu.SystemIndicator {
             (proxy, error) => {
                 if (error) {
                     log(error.message);
-                    return;
-                }
+                } else {
                     this._proxy.connect('g-properties-changed',
                         this._sync.bind(this));
+                }
                 this._sync();
             });