allow context menu on command center (microsoft#156614)

fixes microsoft#156512

Author: sbatten

src/vs/workbench/browser/parts/titlebar/commandCenterControl.ts

@@ -114,7 +114,8 @@ export class CommandCenterControl {
 				} else {
 					return createActionViewItem(instantiationService, action, { hoverDelegate });
 				}
-			}
+			},
+			allowContextMenu: true
 		});
 		const menu = this._disposables.add(menuService.createMenu(MenuId.CommandCenter, contextKeyService));
 		const menuDisposables = this._disposables.add(new DisposableStore());