修复一处奇特的错误

packages/hydrojudge/src/service.ts

@@ -1,6 +1,6 @@
 // Hydro Integration
 /* eslint-disable no-await-in-loop */
-import { } from 'hydrooj';
+import 'hydrooj';
 import path from 'path';
 import cluster from 'cluster';
 import child from 'child_process';
@@ -8,7 +8,7 @@ import { ObjectID } from 'bson';
 import fs from 'fs-extra';
 import { homedir, tmpdir } from 'os';
 
-declare module 'hydrooj' {
+declare module 'hydrooj/dist/interface' {
     interface SystemKeys {
         'hydrojudge.langs': string,
     }