t7003: ensure filter-branch prunes reflogs with the reftable backend
In t7003 we conditionally check whether the reflog for branches pruned
by git-filter-branch(1) get deleted based on whether or not we use the
"files" backend. Same as with the preceding commit, this condition was
added because in its initial iteration the "reftable" backend did not
delete reflogs when their corresponding ref was deleted. Since then, the
backend has been aligned to behave the same as the "files" backend
though, which makes this check unnecessary.
Remove it.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>