Use different path separator under linux

[fabiangeisler]

blender_studio_scripts/startup/__BLENDER_STUDIO_SCRIPTS__.py

Line 24 in 95759ca

SEPARATOR = ";"

The common path separator under linux is : and not ;. Luckily Python already has you covered with os.pathsep. Should be an easy fix. Not sure if I can put in a PR for this soon. Will try when I have a couple of minutes to spare.