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/about.vue

@@ -164,10 +164,10 @@ const headerTabs = computed(() => [{
 	icon: 'ti ti-chart-line',
 }]);
 
-definePageMetadata(computed(() => ({
+definePageMetadata(() => ({
 	title: i18n.ts.instanceInfo,
 	icon: 'ti ti-info-circle',
-})));
+}));
 </script>
 
 <style lang="scss" module>