space age settings not being applied across entrypoints

[hrshtt]

thank you for this fix!

just to be sure, "${INSTALLED_DIRECTORY}"/docker-dlc.sh is still only part of docker entrypoint so DLC_SPACE_AGE=false will also not be applied for the rest of the entrypoints. the same way EXEC w emulator wasnt being applied.

this will break the other entrypoints for those without space age dlc

Originally posted by @hrshtt in #587 (comment)