[lua] Stop Ul'hpemde from diving

[Nobutadas]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Ul'hpemde are not supposed to dive. This makes it so they don't anymore.

https://www.youtube.com/watch?v=CwEWchv8bp0

Steps to test these changes

Go to sea and see that they don't dive anymore. Verify Om'hpemde in the south still dive.