Added check to rte controller so as not to reload tinymce script if it's already loaded (we don't check the CSS, but I figure this is ok) [This is temp bandaid for #U4-4724]

src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.controller.js

@@ -30,7 +30,9 @@ angular.module("umbraco")
             var await = [];
 
             //queue file loading
-            await.push(assetsService.loadJs("lib/tinymce/tinymce.min.js", $scope));
+            if (!tinymce) { // Don't reload tinymce if already loaded
+                await.push(assetsService.loadJs("lib/tinymce/tinymce.min.js", $scope));
+            }
 
             //queue rules loading
             angular.forEach(editorConfig.stylesheets, function(val, key){