disable message-based filtering

the message: predicate applies to the PREVIOUS commit message,
not the one being mailed. oops.
i hope this is just a gerrit bug. mailed them.

project.config

diff --git a/project.config b/project.config
index b4cef07..931fb56 100644
--- a/project.config
+++ b/project.config
@@ -81,7 +81,7 @@
 [notify "codereviews"]
 	email = golang-codereviews@googlegroups.com
 	header = cc
-	filter = -project:scratch AND -message:do-not-review
+	filter = -project:scratch
 [notify "checkins"]
 	email = golang-checkins@googlegroups.com
 	header = to