[gnome-shell] swipeTracker: Remove unused property

[Marge Bot <marge-bot src gnome org>]

commit d271a51bfdd341e6e106f31e6fbc6203e75697e9
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Mar 11 16:08:41 2021 +0100

    swipeTracker: Remove unused property
    
    The :allow-long-swipes GObject property relies on the automatic
    getter/setter added by gjs and is not actually backed by
    _allowLongSwipes.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1765>

 js/ui/swipeTracker.js | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/js/ui/swipeTracker.js b/js/ui/swipeTracker.js
index 9c3671d3cf..f5f4dbb800 100644
--- a/js/ui/swipeTracker.js
+++ b/js/ui/swipeTracker.js
@@ -471,7 +471,6 @@ var SwipeTracker = GObject.registerClass({
         this.orientation = orientation;
         this._allowedModes = allowedModes;
         this._enabled = true;
-        this._allowLongSwipes = false;
         this._distance = global.screen_height;
         this._history = new EventHistory();
         this._reset();