transmission: fix directory creation in init script
Things were done in the wrong order, leading to config_dir not being
chown'ed and subdirectories not being created in case of download_dir
being inside config_dir.
Fixes: 609109fa9 ("transmission: add seccomp filter and improve jail")
Reported-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>