Blackjack: make turn reminders more subtle
Blackjack: make turn reminders more subtle

This makes it so that it will still highlight the user, but it won't appear as if there's an admin named ~Blackjack.

This is a similar method to how ``Monitor.log`` highlights users in the staff room if the message contains a staff member's name.

jd4564/Pokemon-Showdown,jd4564/Pokemon-Showdown