Fixed SCP-860-2's step sounds

[Jabka666]

[Regalis11]

To me it seems like the intention here was to play the sound when the animation has looped around (although, the check for current frame was incorrect, since the animation doesn't start from the first frame). I'm not sure I understand why it was changed to check for going past 568 (wouldn't work if the frame loops around from > 586?)