use applyAsync for compile (grafana#5287)

Author: mtanda

public/app/core/directives/plugin_component.ts

@@ -211,7 +211,7 @@ function pluginDirectiveLoader($compile, datasourceSrv, $rootScope, $q, $http, $
     // let a binding digest cycle complete before adding to dom
     setTimeout(function() {
       elem.append(child);
-      scope.$apply(function() {
+      scope.$applyAsync(function() {
         scope.$broadcast('refresh');
       });
     });