Allow MUC notifications when nick not mentioned.

A very small change.

Currently notifications are not shown for MUC messages unless the users nickname is in the message.

This change will show all room messages in the notification area.  Existing vibrate settings still allow the user to choose vibrate only when nickname is mentioned if they prefer.

I'm not sure if this is how you want it to work, but myself and a few friends use JTalk and would like to get notified of all chat room messages.

Thanks for the a very good Android client with lots of great features, it's the best I've found (and I've tried a lot!).