fix(frontend/pageMetadata): ページタイトルが更新されない問題 (#13289)

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/frontend/src/pages/settings/email.vue

@@ -113,8 +113,8 @@ const headerActions = computed(() => []);
 
 const headerTabs = computed(() => []);
 
-definePageMetadata({
+definePageMetadata(() => ({
 	title: i18n.ts.email,
 	icon: 'ti ti-mail',
-});
+}));
 </script>