[lua] Fixes Dynamis hourglass trade being locked

[Frankie-hz]

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?

Changes the item check for timeless hourglass so the item does not get locked on a failed trade attempt.

Steps to test these changes

First Test
!additem timeless_hourglass
Trade the hourglass to the markings -> FAIL THE TRADE (hit cancel)
Trade it again see that it works.

Second Test
!additem timeless_hourglass
Trade it successfully
Enter Dyna
Leave Dyna
!additem timeless_hourglass
Trade the hourglass again as many times as you want
Get the same "occupying dynamis" message