t9902: switch default branch name to main
Remove the penultimate use of "GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=
master" in our test suite. We have slowly been removing these ever
since we started to switch the default branch name used in tests to
"main".
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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