P_FloorzAtPos slope fix
This fixes P_FloorzAtPos not considering the normal floor slope of the sector the given x/y/z coord is in, if one is set. Though apparently it already did consider FOF slopes, huh.
This fixes P_FloorzAtPos not considering the normal floor slope of the sector the given x/y/z coord is in, if one is set. Though apparently it already did consider FOF slopes, huh.