[gnome-shell] windowManager: Remove excess parameter

[Florian Müllner <fmuellner src gnome org>]

commit 5a414fff44af3090167fc264298a3cb7b81fd7a7
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Sep 18 19:37:07 2017 +0200

    windowManager: Remove excess parameter
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787907

 js/ui/windowManager.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index 16e55fb..dbc2acf 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -516,7 +516,7 @@ var TouchpadWorkspaceSwitchAction = new Lang.Class({
             return Clutter.EVENT_PROPAGATE;
 
         if (event.get_gesture_phase() == Clutter.TouchpadGesturePhase.UPDATE) {
-            let [dx, dy] = event.get_gesture_motion_delta(event);
+            let [dx, dy] = event.get_gesture_motion_delta();
 
             this._dx += dx;
             this._dy += dy;