Fix some tasks having an onExecute method that is not async

Author: renonick87

lib/js/src/manager/screen/_TextAndGraphicUpdateOperation.js

@@ -66,8 +66,8 @@ class _TextAndGraphicUpdateOperation extends _Task {
      * The method that causes the task to run.
      * @param {_Task} task - The task instance
      */
-    onExecute (task) {
-        this._start();
+    async onExecute (task) {
+        await this._start();
     }
     /**
      * If the task is not canceled, starts to assemble the show

lib/js/src/manager/screen/menu/_MenuConfigurationUpdateOperation.js

@@ -53,8 +53,8 @@ class _MenuConfigurationUpdateOperation extends _Task {
      * The method that causes the task to run.
      * @param {_Task} task - The task instance
      */
-    onExecute (task) {
-        this._start();
+    async onExecute (task) {
+        await this._start();
     }
 
     /**

lib/js/src/manager/screen/menu/_MenuShowOperation.js

@@ -49,8 +49,8 @@ class _MenuShowOperation extends _Task {
      * The method that causes the task to run.
      * @param {_Task} task - The task instance
      */
-    onExecute (task) {
-        this._start();
+    async onExecute (task) {
+        await this._start();
     }
 
     /**