Rename duplicate Tombstone NPCs in King Ranperre's Tomb

[claywar]

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• [x] I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• [x] I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• [x] I have read and understood the Contributing Guide and the Code of Conduct.
• [x] 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?

Separates the Tombstone NPCs in King Ranperre's Tomb to Tombstone_Upper and Lower along with updating references to these NPCs.

Steps to test these changes

No changes to gameplay should be observed