Made message group search match words

Imho it's better to show little too much
rather than too little and have the user
to think that something isn't there. Btw
we also have lots of message groups with
a long common prefix, which usually did
not show up in searches.

Change-Id: Ibd523036324e15b75fc6277684578492d8a6d302
Merge "Made message group search match words"