Removing unneeded digest (i think), to prevent an Angular error when we have subsequent applyJsonDiff calls very close together (i.e. slice a clip)

Author: jonoomph

src/timeline/js/controllers.js

@@ -1393,7 +1393,6 @@ App.controller("TimelineCtrl", function ($scope) {
         // Re-index Layer Y values
         $scope.updateLayerIndex();
       }
-      $scope.$digest();
     }
     // return true
     return true;