[1.2.X] Fixed another case-sensitivity bug in Oracle introspection. This one...

[1.2.X] Fixed another case-sensitivity bug in Oracle introspection.  This one was harmless, but it was causing an irritating test failure.
Backport of r15787 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15788 bcc190cf-cafb-0310-a4f2-bffc1f526a37