fix hard-wiring of wavice_coupling config (applies only to CESM)

[mvertens]

Description of changes

fix hard-wiring of wavice_coupling config (applies only to CESM)

Specific notes

This PR has a simple fix (changes nmlgen.set_value to nmlgen.add_default) in order to permit the
setting of wavice_coupling to be changed in user_nl_cpl.

Contributors other than yourself, if any: None

CMEPS Issues Fixed:

Are changes expected to change answers? bfb

Any User Interface Changes (namelist or namelist defaults changes)? No

Testing performed

Testing performed if application target is CESM:
Verified that wavice_coupling could be changed in nuopc.runconfig my changing user_nl_cpl.

Testing performed if application target is UFS-coupled:

• (recommended) UFS-coupled testing
  • description:
  • details (e.g. failed tests):

Testing performed if application target is UFS-HAFS:

• (recommended) UFS-HAFS testing
  • description:
  • details (e.g. failed tests):

Hashes used for testing:

• CESM:
  • repository to check out: https://github.com/ESCOMP/CESM.git
  • tag: cesm2_3_beta09
• UFS-coupled, then umbrella repostiory to check out and associated hash:
  • repository to check out:
  • branch/hash:
• UFS-HAFS, then umbrella repostiory to check out and associated hash:
  • repository to check out:
  • branch/hash: