Fix change detection on items change in command bar when using declarative syntax

Author: Ben Grynhaus

libs/fabric/src/lib/components/command-bar/command-bar.component.ts

@@ -171,6 +171,8 @@ export class FabCommandBarComponent extends ReactWrapperComponent<ICommandBarPro
     ) => {
       this[itemsPropertyKey] = mapper(this[itemsPropertyKey]);
       transformItemsFunc(this[itemsPropertyKey]);
+
+      this.markForCheck();
     };
 
     // Initial items