reflog tests: make use of "test_config" idiom
authorÆvar Arnfjörð Bjarmason <avarab@gmail.com>
Fri, 15 Mar 2019 15:59:55 +0000 (16:59 +0100)
committerJunio C Hamano <gitster@pobox.com>
Mon, 18 Mar 2019 06:09:40 +0000 (15:09 +0900)
Change a couple of tests that weren't using the helper to use it. This
makes the trailing "--unset" unnecessary.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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