[1.0.X] Fixed #8903 -- Corrected rendering of admin inline formsets (tabular...

[1.0.X] Fixed #8903 -- Corrected rendering of admin inline formsets (tabular and stacked) when the inline model has a custom non-autofield primary key. Thanks to dgouldin for the patch.

Merge of r10666 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10670 bcc190cf-cafb-0310-a4f2-bffc1f526a37