ModelUserFieldPermissionMixin: fix error in checking for the right user of an edited model instance #1784
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The mixin so far test for the right user against the first entry of Model.objects.all(). This entry has, most of the time, nothing to do with the actual entry (to edit/update/delete). Now the mixin tests the actual user against the user of the actual model instance given by pk or slug.
Fix tests accordingly. Until now, the tests for the mixin confirm the produced results (anonymous user) and test not the real expectation (second user can't get data of the first user).