Corrected k1 parameter for grounding scheme

[JFLemieux73]

[Remove this and add a short summary line]:

• Developer(s): JF Lemieux

• Please suggest code Pull Request reviewers in the column at right.

• Are the code changes bit for bit, different at roundoff level, or more substantial? NA

• Please include the link to test results or paste the summary block from the bottom of the testing output below.

• Does this PR create or have dependencies on Icepack or any other models? N

• Is the documentation being updated with this PR? (Y/N) N
  If not, does the documentation need to be updated separately at a later time? (Y/N) N

Note: "Documentation" includes information on the wiki and .rst files in doc/source/,
which are used to create the online technical docs at https://readthedocs.org/projects/cice-consortium-cice/.

• Other Relevant Details:

k1 was 20. It is now set to the rigth value (k1=8).

I also removed a comment in ice_dyn_evp.F90 saying that we save the replacement pressure for principal_stress (not used anymore).

[apcraig]

I'm fine with this change, but just want to make sure @eclare108213 has a quick look in case we need to defer or otherwise. I assume this will change answers for at least a couple tests and that we don't need to run the qc or otherwise beforehand.

[eclare108213]

This is fine, fixing a bug.
@JFLemieux73 we don't have to do this now, but does it make sense to have these parameters in the namelist?