Adding name to the list of uneditable items in preferences UI

  * If enable_names,  enable_sso, and sso_overrides_name settings are true.
  * Added serialization of can_edit_name so the UI has access to the right.

Was missing the serialization of can_edit_name in the first pull.

See the following for reference.
https://github.com/discourse/discourse/pull/2116
#2033
#2080
#2091
https://meta.discourse.org/t/change-full-name-in-profile/13696