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/windowManager.js

@@ -2035,7 +2035,7 @@ var WindowManager = class {
         this._tilePreview.show(window, tileRect, monitorIndex);
     }
 
-    _hideTilePreview(shellwm) {
+    _hideTilePreview() {
         if (!this._tilePreview)
             return;
         this._tilePreview.hide();
@@ -2103,11 +2103,11 @@ var WindowManager = class {
             app.activate();
     }
 
-    _toggleAppMenu(display, window, event, binding) {
+    _toggleAppMenu() {
         Main.panel.toggleAppMenu();
     }
 
-    _toggleCalendar(display, window, event, binding) {
+    _toggleCalendar() {
         Main.panel.toggleCalendar();
     }