Corrected Bioethics quest checks in the Biochemist NPC

- As of 4ea6d474 (almost 7 years ago!) the correct check is bioeth==13,
  rather than MISC_QUEST&64. Special thanks to ossi0110.
- Minor tweaks to the script to match Hercules standards.

Signed-off-by: Haru <haru@dotalux.com>