Add some minor NPC fixes

[skyleo]

Pull Request Prelude

• [x] I have followed proper Hercules code styling.
• [x] I have read and understood the contribution guidelines before making this PR.
• [x] I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

• Make the order in dual monster races not matter as on officials
• Simplify MN() function in Dual Monster Race logic
• Ensure only 1 instance of the Pickpocket Quest NPC
• Fix a case of the Doctor Quest taking items and not rewarding in return (and potentially some exploits)

Issues addressed: None?

[skyleo]

Safe to review now, won't force-push anymore.

[skyleo]

Just a tiny commit rename. 👀 safe now.