Remove correction_pars

[melanieclarke]

JWST removed the only usage of the Step attribute correction_pars in spacetelescope/jwst#10432.

Since it's no longer used, we can now remove support for this attribute in stpipe as well:

stpipe/src/stpipe/step.py

Lines 61 to 65 in 6ab15df

	# Correction parameters. These store and use whatever information a Step
	# may need to perform its operations without re-calculating, or to use
	# from a previous run of the Step. The structure is up to each Step.
	correction_pars = None
	use_correction_pars = False