core: 修复总是显示用户当前离线的问题

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.17.17",
+    "version": "2.17.18",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
@@ -61,4 +61,4 @@
         "build": "tsc",
         "build:watch": "tsc --watch"
     }
-}
+}

packages/hydrooj/src/model/token.ts

@@ -80,7 +80,7 @@ export function getSessionListByUid(uid: number) {
 }
 
 export async function getMostRecentSessionByUid(uid: number) {
-    const res = await coll.find({ uid, tokenType: TYPE_SESSION }).sort('updateAt', -1);
+    const res = await coll.find({ uid, tokenType: TYPE_SESSION }).sort('updateAt', -1).toArray();
     return res[0];
 }