cleanup: Remove some unhelpful unused arguments

Those unused arguments aren't bugs - unbeknownst to eslint, they all
correspond to valid signal parameters - but they don't contribute
anything to clarity, so just remove them anyway.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/627

js/ui/shellDBus.js

@@ -335,7 +335,7 @@ var ScreenSaverDBus = class {
         screenShield.connect('active-changed', shield => {
             this._dbusImpl.emit_signal('ActiveChanged', GLib.Variant.new('(b)', [shield.active]));
         });
-        screenShield.connect('wake-up-screen', shield => {
+        screenShield.connect('wake-up-screen', () => {
             this._dbusImpl.emit_signal('WakeUpScreen', null);
         });