UI enhancement fixes 2 (#3225)

- Fixed incorrect CSS naming: `c-frame-edit__move` changed to
 `c-frame__move-bar`;
 - Fixed `display: contents` that was erroneously applied to
 `u-angular-object-view-wrapper` and preventing styling from being
 applied to plots, renamed class to `.l-angular-ov-wrapper`;
 - Removed commented CSS;

src/ui/preview/Preview.vue

@@ -95,7 +95,7 @@ export default {
 
             this.viewKey = view.key;
             this.viewContainer = document.createElement('div');
-            this.viewContainer.classList.add('u-angular-object-view-wrapper');
+            this.viewContainer.classList.add('l-angular-ov-wrapper');
             this.$refs.objectView.append(this.viewContainer);
 
             this.view = this.currentView.view(this.domainObject, this.objectPath);