refactor(frontend): fix eslint error

Author: saschanaz

packages/frontend/src/scripts/get-user-menu.ts

@@ -116,7 +116,7 @@ export function getUserMenu(user: misskey.entities.UserDetailed, router: Router
 		icon: 'ti ti-at',
 		text: i18n.ts.copyUsername,
 		action: () => {
-			copyToClipboard(`@${user.username}@${user.host || host}`);
+			copyToClipboard(`@${user.username}@${user.host ?? host}`);
 		},
 	}, {
 		icon: 'ti ti-info-circle',