fix(sideMenu): allow edge-drag-threshold for right side menus. Closes #2081

Author: perrygovier

Diff for: js/angular/controller/sideMenuController.js

@@ -346,7 +346,7 @@ function($scope, $attrs, $ionicSideMenuDelegate, $ionicPlatform, $ionicBody) {
 
     var dragIsWithinBounds = !shouldOnlyAllowEdgeDrag ||
       startX <= self.edgeThreshold ||
-      startX >= self.content.offsetWidth - self.edgeThreshold;
+      startX >= self.content.element.offsetWidth - self.edgeThreshold;
 
     return ($scope.dragContent || self.isOpen()) &&
            dragIsWithinBounds &&