Remove "must play other tables first" from completed games.

[davypi]

I want to go look at the results page for an arena game that has completed, but when I do so, the interface is blocked with the message "You must play this other game first. Arena turn-based games rule: you must play on the table where it has been your turn for the longest time." I'm fine with this rule in the situation where the game is active, but if the game I'm viewing is complete, there is no reason for this rule to be enforced.