remove REFFILES prerequisite for some tests in t1405 and t2017
These tests are compatible with the reftable backend and thus do not
need the REFFILES prerequisite. Even though
53af25e4
(t1405: mark test that checks existence as REFFILES, 2022-01-31) and
53af25e4 (t1405: mark test that checks existence as REFFILES,
2022-01-31) marked these tests to require REFFILES, the reftable backend
in its current state does indeed work with these tests.
Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>