Fixed geographic admin to be compatible with `ModelAdmin.formfield_for_dbfield` changes in r9760.
Fixed geographic admin to be compatible with `ModelAdmin.formfield_for_dbfield` changes in r9760.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@9763 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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