[lua] Bug fix quest "Rock Racketeer" wrong prog value check

[slashtangent]

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• 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 a bug where the optional dialogue is checking for the wrong Prog value.
Updates the check from Prog == 3 to Prog == 2.
Prog will never be 3 in the current code.

Steps to test these changes

Start quest.
!setquestvar <me> 2 26 Prog 2
Talk to Varun.