ui: autocomplete: dnd support

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.34.35",
+  "version": "4.34.36",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
@@ -77,6 +77,8 @@
     "queue-microtask": "^1.2.3",
     "raw-loader": "^4.0.2",
     "react": "^17.0.2",
+    "react-dnd": "^16.0.0",
+    "react-dnd-html5-backend": "^16.0.0",
     "react-dom": "^17.0.2",
     "react-redux": "^7.2.8",
     "react-split-pane": "^0.1.92",