Inactive browser tab vs Active browser tab both lose

[ltfschoen]

If you start one player in a Brave browser window tab, then start another player in a new incognito window of Brave, then if the first player changes to a different tab in the browser whilst the other player plays and clears a block, then when you open the second players window only then does their block obstacle appear, and if they don't clear any blocks you'd expect the second player to win since they cleared a block, but the result is that both lose for some reason...

Maybe need to check if the current browser tab isn't active at all during the game then the player automatically loses or game is invalidated... and prevent this behaviour repeating somehow