Fix textOffset for Magian Trial #1826

[claywar]

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• 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?

Changes textOffset for magian trial 1826 to reflect the requirement of finishing blows with Final Heaven against beasts

Steps to test these changes

1. !exec player:addItem(xi.item.SPHARAI, 1, 740, 5)
2. Trade item to moogle
3. Verify correct message as below