[core] [lua] Adjust when magian trials are attached

[WinterSolstice8]

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?

This fixes a potential bug with item scripts load order (item script functions that ALSO have magian listeners would be clobbered)

Steps to test these changes

Check an item with a listener on it such as Gungnir (75)