Use TM5 implementation of seasalt emission scheme

[plesager]

Switch from HAMM7 to TM5 implementation of the "Gong + SST" seasalt emissions scheme.

Summary by CodeRabbit

• Bug Fixes
  • Corrected the default sea-salt emission setting in builds without HAMMOZ, ensuring sea-salt emissions are disabled by default.

[coderabbitai]

📝 Walkthrough

Walkthrough

The default nseasalt value for builds without HAMMOZ is changed from 8 to 0 in mo_ham.F90.

Changes

Sea-salt emission configuration

Layer / File(s)	Summary
Update non-HAMMOZ default ifs-source/arpifs/m7/module/mo_ham.F90	The non-HAMMOZ default initialization of nseasalt changes from 8 to 0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: switching to the TM5 sea-salt emission scheme implementation.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch default-seasalt-emission

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