mq: correct test output stable

mq: correct test output

--- a/tests/test-mq-qnew.out	Fri Mar 05 10:49:56 2010 +0100
+++ b/tests/test-mq-qnew.out	Fri Mar 05 12:27:23 2010 +0100
@@ -57,6 +57,7 @@
 abort: ".hgignore" cannot be used as the name of a patch
 abort: ".mqfoo" cannot be used as the name of a patch
 abort: "foo#bar" cannot be used as the name of a patch
+abort: "foo:bar" cannot be used as the name of a patch
 % qnew with uncommitted changes
 uncommitted.patch
 % qnew implies add