Changed condition for insert inlines PK fields

I added TranslatableTabularInline class to my admin models and got `MultiValueDictKeyError` error when I was trying to save. I see that templates `/admin/hvad/edit_inline/` are old and update them by current version in Django's codebase (https://github.com/django/django/commit/3aad955ea8db1592fad0012155eaa25b72e50dc5).