[gnome-shell] barLevel: Remove duplicated assignment

[Florian Müllner <fmuellner src gnome org>]

commit 6b7af407e104f9315326b7c1abdc6404ba665b22
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 12 14:01:57 2019 +0200

    barLevel: Remove duplicated assignment
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1500

 js/ui/barLevel.js | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/js/ui/barLevel.js b/js/ui/barLevel.js
index 489aec5d27..89f9d62d64 100644
--- a/js/ui/barLevel.js
+++ b/js/ui/barLevel.js
@@ -55,7 +55,6 @@ var BarLevel = GObject.registerClass({
         if (this._value == value)
             return;
 
-        this._value = value;
         this._value = value;
         this.notify('value');
         this.queue_repaint();