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/ui/sessionMode.js

@@ -120,7 +120,7 @@ function _loadMode(file, info) {
         if (fileContent instanceof Uint8Array)
             fileContent = imports.byteArray.toString(fileContent);
         newMode = JSON.parse(fileContent);
-    } catch(e) {
+    } catch (e) {
         return;
     }