rest_views/TestSet: fix filtering
Filtering tests didn't work because of typo, filter_class instead of filterset_class.
I've also removed filter_fields data because it's not needed, all of the filtering is definted in filterset_class - TestFilter.
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Filtering tests didn't work because of typo, filter_class instead of filterset_class.
I've also removed filter_fields data because it's not needed, all of the filtering is definted in filterset_class - TestFilter.