Turn off screen-saver (attract mode color cycling) if joystick is used

[frachel]

Once attract mode is in effect, Joystick movement doesn't disable it. Add code to disable it when the joystick is used.

"Joysticks alone will not reset location 77 to zero. You will have to add a POKE 77,0 to your program periodically or frequently call in a subroutine to prevent the Atari from entering attract mode if you are not using any keyboard input."