fix(typeahead): update isOpen on escape

This updates isOpen immediately when pressing escape button.

Fixes #5579
Closes #5587

src/typeahead/typeahead.js

@@ -401,7 +401,7 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.debounce', 'ui.bootstrap
           evt.stopPropagation();
 
           resetMatches();
-          scope.$digest();
+          scope.$parent.$digest();
           break;
         case 38:
           scope.activeIdx = (scope.activeIdx > 0 ? scope.activeIdx : scope.matches.length) - 1;