diffcore-rename: fix merging back a broken pair.
diffcore-rename: fix merging back a broken pair.

When a broken pair is matched up by rename detector to be merged
back, we do not want to say it is "dissimilar" with the
similarity index.  The output should just say they were changed,
taking the break score left by the earlier diffcore-break run if
any.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git