[LUA] Fix Better Part of Valor waterfall trigger

[whiskeyhughes]

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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?

Fixes the waterfall ??? interaction for the Bastok [S] quest Better Part of Valor.

The quest was binding event 3 to qm1, but the ??? at the documented waterfall coordinates in North Gustaberg [S] is qm3.

This changes the quest interaction binding from:

['qm1']

to:

['qm3']

No SQL changes are required because the correct qm3 entity already exists at the waterfall location.

Steps to test these changes

1. Add the quest and set the character to the waterfall stage:

   !addquest 7 12
   !setquestvar <PlayerName> 7 12 Prog 1
   !pos -232 41 425 88
   

2. Interact with the waterfall ???.

3. Confirm event 3 begins.

4. Complete the cutscene.

5. Check the quest variable:

   !getquestvar <PlayerName> 7 12 Prog
   

6. Confirm Prog advances to 2.

[Xaver-DaRed]

On hold: This is byproduct of a shift with qm names that happened recently.