[lua, quest] Converts BRD unlock and BRD AF1 to IF

[CriticalXI]

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?

• Converts Path of the Bard and Painful Memory BRD quests to interaction framework

Path of the Bard: https://www.youtube.com/watch?v=ZAJAjoMJFdo
Painful Memory: https://www.youtube.com/watch?v=QXsns9eag10

Steps to test these changes

• Complete A Minstrel in Despair quest either manually or through GM commands
• Speak with Song Runes in Valkurm Dunes to complete Path of the Bard quest
• Set yourself to BRD 40 to start Painful Memory quest and follow the quest steps

[Xaver-DaRed]

onTrigger = function(player, npc)
    local initialCS = quest:getVar(player, 'initialCS')
    if initialCS == 0 then
        return quest:progressEvent(138)
    elseif initialCS == 1 then
        return quest:progressEvent(137)
    end
end,

[CriticalXI]

Adjusted to the example

[Xaver-DaRed]

Theres only 1 condition here. Also, as above, store the variable in a local var instead of fetching it.