core: home_domain: only show joined

packages/hydrooj/src/model/domain.ts

@@ -251,7 +251,7 @@ class DomainModel {
 
     @ArgMethod
     static async getDictUserByDomainId(uid: number) {
-        const dudocs = await collUser.find({ uid }).toArray();
+        const dudocs = await collUser.find({ uid, join: true }).toArray();
         const dudict: Record<string, any> = {};
         for (const dudoc of dudocs) dudict[dudoc.domainId] = dudoc;
         return dudict;