mailmap tests: use our preferred whitespace syntax

mailmap tests: use our preferred whitespace syntax

Change these tests to use the preferred whitespace around ">",
"<<-EOF" etc. This is an initial step in larger and more meaningful
refactoring of the file, which makes a subsequent commit easier to
read.

I'm not changing the whitespace of "echo <str> > file" patterns to
"echo <str> >file" because all of those will be changed to here-docs
in a subsequent commit.

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