Fixed #28549 -- Fixed QuerySet.defer() with super and subclass fields. #8994
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Previously, deferring on multiple fields (in different classes) did not
properly omit the superclass' defered field; we were iterating the
fields from SubClass._meta.fields as well as SuperClass._meta.fields,
and only deferred one of those.
Changed to iterate .local_fields only, so we do the correct filtering.
Thanks to Simon Charette for the suggested fix.