 the two must be identical.
2. load_on_startup    (boolean, optional) Save wallet name to persistent settings and load on startup. True to add wallet to startup list, false to remove, null to leave unchanged.

Result:
{                       (json object)
  "warning" : "str",    (string, optional) Warning messages, if any, related to unloading the wallet. Multiple messages will be delimited by newlines. (DEPRECATED, returned only if config option -deprecatedrpc=walletwarningfield is passed.)
  "warnings" : 