Relay: Set msg.channel before passing it to _sendToOthers.

_sendToOthers expects msg.channel to be 'in otherIrc.state.channels',
but IrcMsg objects don't have their 'channel' attribute set until they
are passed through irclib, so it was left unset, which means messages
were never sent at all.

Regression introduced in c1ae3f5c81.

plugins/Relay/plugin.py

@@ -299,9 +299,13 @@ class Relay(callbacks.Plugin):
         msg = dynamic.msg
         if self.registryValue('noticeNonPrivmsgs', target, network) and \
            msg.command != 'PRIVMSG':
-            return ircmsgs.notice(target, s)
+            m = ircmsgs.notice(target, s)
         else:
-            return ircmsgs.privmsg(target, s)
+            m = ircmsgs.privmsg(target, s)
+
+        m.channel = target
+
+        return m
 
     def doJoin(self, irc, msg):
         irc = self._getRealIrc(irc)