more shiftcorrection bug fixes

Created by: kevindkim723

notes:

• hypothesizing that corrshiftsz size is consistently 2 bits smaller than normshiftsz
• suspicious that normshiftsz is dependent on CVTLEN but corrshiftsz isn't (fixed this so that corrshiftsz only relies on normshiftsz)
• corrsumshifted is produced from a mux with a width of normshiftsz-2. changed signal width of corrsumshifted to reflect that instead of statically held at 3 * NF +3