Resolving images with `_IMAGES` in `SingularityCommandLineJob` appears to write back to the wrong field

[adamnovak]

It looks like we write a resolved image to dockerImage_id here, but that field on the requirement is never read.

cwltool/cwltool/singularity.py

Lines 234 to 237 in 8949fc2

	d_image_id = dockerRequirement["dockerImageId"]
	if d_image_id in _IMAGES:
	if (resolved_image_id := _IMAGES[d_image_id]) != d_image_id:
	dockerRequirement["dockerImage_id"] = resolved_image_id