fix: typo. Don't override domain_name with IDP ID

Author: jorwoods

tableauserverclient/models/user_item.py

@@ -255,7 +255,7 @@ def _set_values(
         if domain_name:
             self._domain_name = domain_name
         if idp_configuration_id:
-            self._domain_name = idp_configuration_id
+            self._idp_configuration_id = idp_configuration_id
 
     @classmethod
     def from_response(cls, resp, ns) -> list["UserItem"]: