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/ui/endSessionDialog.js

@@ -398,7 +398,7 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
         // Use a different description when we are installing a system upgrade
         // if the PackageKit proxy is available (i.e. PackageKit is available).
         if (dialogContent.upgradeDescription) {
-            const { name, version } = this._updateInfo.PreparedUpgrade;
+            const {name, version} = this._updateInfo.PreparedUpgrade;
             if (name != null && version != null)
                 description = dialogContent.upgradeDescription(name, version);
         }