[lua] Fix Signpost text in Buburimu Peninsula

[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?

Fixes the message sent by the 7 Signposts in Buburimu Peninsula.

For convenience, these were the sign IDs and Message ID captured
17261165 - 7416 - SIGN_1
17261166 - 7416
17261167 - 7416
17261168 - 7417
17261169 - 7418
17261170 - 7419
17261171 - 7420

Capture showing order: https://drive.google.com/file/d/17BgPmq3z070WEK9a3I4e-9WyjAIpJySV/view?usp=drive_link

Steps to test these changes

Go to Bubu and click all the signs.