Revert "Wrap large and negative shifts"
Revert "Wrap large and negative shifts"

This reverts commit c1b25b9281943e53e17f8ee2b9d1a13115ecd0eb.

The commit is being reverted as we do not need to ensure all shifts are
positive in this way. They already are as the shift was determined by an
array index corresponding to the largest value. So this will always be
positive semi-definite.

jakirkham/nanshe,DudLab/nanshe,nanshe-org/nanshe,jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe