修复ui可能会被多次加载的问题

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hydrooj",
-  "version": "2.9.6",
+  "version": "2.9.8",
   "main": "dist/loader.js",
   "bin": "bin/hydrooj.js",
   "repository": "https://github.com/hydro-dev/Hydro.git",
@@ -31,7 +31,7 @@
     "moment-timezone": "^0.5.31",
     "mongodb": "^3.5.9",
     "nodemailer": "^6.4.10",
-    "nunjucks": "^3.2.1",
+    "nunjucks": "^3.2.2",
     "prismjs": "^1.20.0",
     "serialize-javascript": "^4.0.0",
     "sockjs": "^0.3.20",
@@ -53,7 +53,7 @@
     "@types/lru-cache": "^5.1.0",
     "@types/markdown-it": "^10.0.1",
     "@types/mongodb": "^3.5.25",
-    "@types/node": "^14.0.22",
+    "@types/node": "^14.0.24",
     "@types/nodemailer": "^6.4.0",
     "@types/nunjucks": "^3.1.3",
     "@types/prismjs": "^1.16.1",
@@ -62,12 +62,13 @@
     "@types/superagent": "^4.1.8",
     "@types/superagent-proxy": "^2.0.0",
     "@types/yargs": "^15.0.5",
-    "@typescript-eslint/eslint-plugin": "^3.6.0",
-    "@typescript-eslint/parser": "^3.6.0",
+    "@typescript-eslint/eslint-plugin": "^3.7.0",
+    "@typescript-eslint/parser": "^3.7.0",
     "eslint": "^7.5.0",
     "eslint-config-airbnb-base": "^14.2.0",
     "eslint-import-resolver-typescript": "^2.0.0",
     "eslint-plugin-import": "^2.20.2",
+    "ts-node": "^8.10.2",
     "typescript": "^3.9.7"
   },
   "scripts": {
@@ -75,4 +76,4 @@
     "build:watch": "tsc --watch",
     "lint": "eslint bin hydro tool --ext ts,js --fix"
   }
-}
+}