(web) Don't allow to move a read-only event

Fixes #4228

UI/Templates/SchedulerUI/UIxAppointmentViewTemplate.wox

@@ -45,7 +45,7 @@
                 </md-menu-content>
               </md-menu>
             </md-menu-item>
-            <md-menu-item>
+            <md-menu-item ng-hide="::editor.component.isReadOnly">
               <md-menu>
                 <md-button label:aria-label="Move To" ng-click="$mdMenu.open($event)">
                   <var:string label:value="Move To"/>