Trivia: support picking a random mode (#6731)
Trivia: support picking a random mode (#6731)

Co-authored-by: Kris Johnson <a1c45178637a62ab9950d608aef0f94a2f6ac4dd@users.noreply.github.com>
xfix/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,svivian/Pokemon-Showdown,Zarel/Pokemon-Showdown,AustinXII/Pokemon-Showdown,xfix/Pokemon-Showdown,Enigami/Pokemon-Showdown,xfix/Pokemon-Showdown,svivian/Pokemon-Showdown,Zarel/Pokemon-Showdown,Enigami/Pokemon-Showdown,urkerab/Pokemon-Showdown,xfix/Pokemon-Showdown,svivian/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,Zarel/Pokemon-Showdown,urkerab/Pokemon-Showdown,urkerab/Pokemon-Showdown,AustinXII/Pokemon-Showdown,xfix/Pokemon-Showdown,Enigami/Pokemon-Showdown,svivian/Pokemon-Showdown,sirDonovan/Pokemon-Showdown