pixel_scale_ratio step parameter is ignored in the resample step

[mcara]

While I did not do a full investigation, I believe that commenting out pixel_scale_ratio in https://github.com/spacetelescope/jwst/pull/6921 - see https://github.com/jemorrison/jwst/blob/844646c47071683df3428454e295e616a09fab89/jwst/resample/resample_step.py#L187 has caused the issue described the help desk ticket INC0180832, that is, pixel_scale_ratio is ignored altogether.

CC: @cshanahan1, @hbushouse