Set PREF_NOTIFY_MENTION_WHOLE_WORD to true.
If I'm not mistaken the _mucwin_print_mention() / get_mentions()
functions only work correctly since
6bc440c6f7.
This changed the behaviour for users.
They got notified when their nick was `kaffee` and in the message the
string `kaffeekanne` occured.
Setting `/notify room mention word_whole` corrected this.
So my idea is that only now the mention function work correctly. And to
have a good default behaviour we should set the `word_whole` on by
default.
Regards https://github.com/profanity-im/profanity/issues/1578