Don't show /COMMIT_MSG in change emails

The magical /COMMIT_MSG file that we wedge into the PatchList
in order to support reviewing the message itself shouldn't be
displayed as if it were a file added by the author.

Change-Id: I211a3a41ec7e2a2eff709beb3230cc162f7c095c
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed