tests: paint unexpectedly fixed known breakages in bold red

tests: paint unexpectedly fixed known breakages in bold red

Change color of unexpectedly fixed known breakages to bold red.  An
unexpectedly passing test indicates that the test code is somehow
broken or out of sync with the code it is testing.  Either way this is
an error which is potentially as bad as a failing test, and as such is
no longer portrayed as a pass in the output.

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>