remove ftp

ftp feature conflicts with ldap. for the moment, we will only allow
sftp integration in "development" apps

CloudronManifest.json

@@ -13,12 +13,7 @@
   "icon": "logo.png",
   "addons": {
     "mysql": {},
-    "localstorage": {
-      "ftp": {
-        "uid": 33,
-        "uname": "www-data"
-      }
-    },
+    "localstorage": {},
     "sendmail": {},
     "ldap": {},
     "scheduler": {