core: fix login redirect

packages/hydrooj/src/handler/user.ts

@@ -125,10 +125,8 @@ class UserLoginHandler extends Handler {
         this.session.sudo = null;
         this.session.scope = PERM.PERM_ALL.toString();
         this.session.save = rememberme;
-        this.response.redirect = (redirect ? decodeURIComponent(redirect) : '')
+        this.response.redirect = redirect || ((this.request.referer || '/login').endsWith('/login')
-            || ((this.request.referer || '/login').endsWith('/login')
+            ? this.url('homepage') : this.request.referer);
-                ? this.url('homepage')
-                : this.request.referer);
     }
 }