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/misc/systemActions.js

@@ -284,7 +284,7 @@ const SystemActions = GObject.registerClass({
 
         let results = [];
 
-        for (let [key, { available, keywords }] of this._actions) {
+        for (let [key, {available, keywords}] of this._actions) {
             if (available && terms.every(t => keywords.some(k => k.startsWith(t))))
                 results.push(key);
         }