Fix DM reminders trying to load guild data

reminder-dashboard/src/components/App/Mentions.tsx

@@ -7,6 +7,10 @@ import { useGuild } from "./useGuild";
 export const Mentions = ({ input }) => {
     const guild = useGuild();
 
+    return <>{guild && <_Mentions guild={guild} input={input} />}</>;
+};
+
+const _Mentions = ({ guild, input }) => {
     const { data: roles } = useQuery(fetchGuildRoles(guild));
     const { data: channels } = useQuery(fetchGuildChannels(guild));
     const { data: emojis } = useQuery(fetchGuildEmojis(guild));