don't blink in chats on messages from history

git-svn-id: http://svn.miranda-ng.org/main/trunk@7618 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
d-damn

git-svn-id: http://svn.miranda-ng.org/main/trunk@7619 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c