* fixes bad arguments to /datum/footstep/Attach() (vary to sound_vary) (#61231)
#60479 changed the attach argument "vary" into "sound_vary" but didnt change the two associative arguments for vary to sound_vary. this does that. now Attach() wont runtime for the footstep element
* fixes bad arguments to /datum/footstep/Attach() (vary to sound_vary)
Co-authored-by: Kylerace <kylerlumpkin1@gmail.com>