fix: removed unneeded package that was also causing build issues

Author: subnub

backend/controllers/storage-controller.ts

@@ -39,7 +39,6 @@
     "core-js": "^3.6.4",
     "cors": "^2.8.5",
     "dayjs": "^1.11.13",
-    "diskusage": "^1.1.3",
     "dotenv": "^8.2.0",
     "express": "^4.19.2",
     "express-validator": "^7.1.0",