style: Use space after catch

We are currently inconsistent with whether or not to put a space
after catch clauses. While the predominant style is to omit it,
that's inconsistent with the style we use for any other statement.
There's not really a good reason to stick with it, so switch to
the style gjs/eslint default to.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/607

js/misc/util.js

@@ -93,7 +93,7 @@ function spawnApp(argv) {
 
         let context = global.create_app_launch_context(0, -1);
         app.launch([], context);
-    } catch(err) {
+    } catch (err) {
         _handleSpawnError(argv[0], err);
     }
 }