Rematch fix

Please make it so that we can see if the other player has left the page after we offer them a rematch. If we don't offer them a rematch then when they leave the button becomes un-clickable, however if you do then you have to decline it in order to check if they left and that's fairly annoying.

Red exit sign next to their name on the right means that they've left the page. Green strong signal sign means that they're at the page.