bisect: report the found commit with "show"

bisect: report the found commit with "show"

When "git bisect" finds the first bad commit and shows it to the user,
it calls "git diff-tree" to do so, whose output is meant to be stable
and deliberately ignores end-user customizations.

As the output is supposed to be consumed by humans, replace this with
a call to "git show". This command honors configuration options (such
as "log.date" and "log.mailmap") and other UI improvements (renames
are detected).

Pass some hard-coded options to "git show" to make the output similar
to the one we are replacing, such as showing a patch summary only.

Reported-by: Michael Osipov <michael.osipov@innomotics.com>
Signed-off-By: Peter Krefting <peter@softwolves.pp.se>
Signed-off-by: Junio C Hamano <gitster@pobox.com>