Changed end game message for two player games

-End game message now says 'Yay, you won!!' instead of 'No more lives!'
( which is wrong, since the player might have lives )
Fixed AI not working

How to reproduce
-Start a game
-Press 'a' to let AI control the Paddle
-Launch a Ball
-AI move will not move the Paddle

Fix
-Changed check in AIMove() to check for isAIControlled instead of is not
AIControlled