Tweaked loaddata command to re-use a calculated value.
Tweaked loaddata command to re-use a calculated value.

Removed a dublicated call to get_public_serializer_formats which
had already populated self.serialization_formats.

Thanks to Nick Pope for review.

adamchainz/django,freakboy3742/django,pauloxnet/django,auvipy/django,shaib/django,rsalmaso/django,dsanders11/django,blighj/django,MarkusH/django,monetate/django,dsanders11/django,atul-bhouraskar/django,koordinates/django,blighj/django,auvipy/django,felixxm/django,manhhomienbienthuy/django,shaib/django,rsalmaso/django,felixxm/django,dsanders11/django,ghickman/django,manhhomienbienthuy/django,shaib/django,takis/django,wkschwartz/django,dsanders11/django,monetate/django,elena/django,wkschwartz/django,solarissmoke/django,ghickman/django,pauloxnet/django,auvipy/django,solarissmoke/django,atul-bhouraskar/django,ghickman/django,koordinates/django,rsalmaso/django,felixxm/django,auvipy/django,blighj/django,adamchainz/django,elena/django,apollo13/django,monetate/django,ghickman/django,pauloxnet/django,solarissmoke/django,elena/django,wkschwartz/django,monetate/django,koordinates/django,django/django,freakboy3742/django,elena/django,atul-bhouraskar/django,wkschwartz/django,MarkusH/django,MarkusH/django,MarkusH/django,freakboy3742/django,shaib/django,django/django,apollo13/django,blighj/django,felixxm/django,apollo13/django,manhhomienbienthuy/django,takis/django,apollo13/django,takis/django,django/django,pauloxnet/django,atul-bhouraskar/django,manhhomienbienthuy/django,adamchainz/django,rsalmaso/django,django/django,takis/django,adamchainz/django,koordinates/django,solarissmoke/django