Fixed #14090 - Many sql queries needed to display change user form

  
Thanks to Suor for report and patch.

Backport for [13683] from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13684 bcc190cf-cafb-0310-a4f2-bffc1f526a37