Update module.js

Fixed flickering effect being caused with the addition and removal of the overclass on drag. When OnDragLeave event triggers the logic should be if the two elements are not the same remove the over class, otherwise return.

Author: rylan

src/module.js

@@ -1150,7 +1150,7 @@ module
              * Event handler
              */
             FileDrop.prototype.onDragLeave = function(event) {
-                if (event.currentTarget !== this.element[0]) return;
+                if (event.currentTarget === this.element[0]) return;
                 this._preventAndStop(event);
                 angular.forEach(this.uploader._directives.over, this._removeOverClass, this);
             };