core: fix judger login if builtin login disabled (#1155)

packages/hydrojudge/src/hosts/hydro.ts

@@ -221,7 +221,8 @@ export default class Hydro implements Session {
     async login() {
         log.info('[%s] Updating session', this.config.host);
         const res = await this.post('login', {
-            uname: this.config.uname, password: this.config.password, rememberme: 'on',
+            uname: this.config.uname, password: this.config.password,
+            rememberme: 'on', judge: 'on',
         });
         const setCookie = res.headers['set-cookie'];
         await this.setCookie(Array.isArray(setCookie) ? setCookie.join(';') : setCookie);