t7606 (merge-theirs): modernize style

Guard setup commands with test_expect_success, so they are easier
to visually skip over and get to the good part.  While at it:

 - use test_commit for brevity and reproducible object names;

 - use test_cmp instead of using the test builtin to compare the
   result of command substitution, for better output with -v on
   failure.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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