Display more logically correct status message when FB user profile details call does not return user data

[aratidgr8]

FB details API call

URL: newfold-facebook/v1/facebook/details

In case of failure, we are getting below response:

{
"status": "success",
"details": "token not found!"
}

It seems like this is something that might warrant an error message.
Typically, status might return "error" and then we know that "details" (or maybe "message") would return a note about what went wrong. Look to the wp_send_json_success() and wp_send_json_error() functions for a good pattern.

CC: @wpscholar