[LUA] Fix Rank 2-3 mission BCNM doesn't award KI on win

[ampitere]

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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?

The recent BCNM rework missed a small edge case where the win var was changed to 999 instead of 0. As a result, when you win the Rank 2-3 mission BCNM you are not awarded the KI. It doesn't seem like this should cause any issues being 0, at least I did not run into any.

Steps to test these changes

Bastok

1. !setnation 1
2. !addmission 1 8
3. !exec player:setMissionStatus(1, 9)
4. !zone Horlais Peak
5. Enter BCNM and win

Windurst

1. !setnation 1
2. !addmission 2 8
3. !exec player:setMissionStatus(2, 9)
4. !zone Horlais Peak
5. Enter BCNM and win

If you test both make sure you !completequest before changing over, also !delkeyitem KINDRED_CREST since they both award the same KI.