[lua] Fixes astral flow not going off

[Frankie-hz]

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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?

Astral flow was not firing off because of an edge case where it needs its target defined in the useMobAbility until re-write

Steps to test these changes

Go to kirin, !hp 30 and watch the astral flow go off