[FIX] http: refresh request environment after authentication

This allow the `/web/session/authenticate` route to return correct
partner and company.

Closes #25652

openerp/http.py

@@ -1135,6 +1135,8 @@ class OpenERPSession(werkzeug.contrib.sessions.Session):
         request.uid = uid
         request.disable_db = False
 
+        del request.env
+
         if uid: self.get_context()
         return uid