Show When PBMM Is Enabled/Disabled

[anon94654444]

this is a duplicate suggestion

'PBMM is on' chat message

i feel like a nice QoL feature to add would be to add a simple message to show that Platform Based Matchmaking (PBMM for short, used in the title) is on; the message would appear as soon as the game starts, along with the ‘No teaming/cross-teaming’ message. This could be handy so you can know what tactic to use, as my tactics vary depending on the other players platform.

@maybeSheila