[lua] Update Dialogue to reference correct brother in The Competition

[slashtangent]

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?

Adds a 1 to arg0 on event 309 to reference Joulet instead of Gallijaux which is 0.

Steps to test these changes

Talk to Joulet to start the quest.
Talk to Ufanne.