Ran the transmission init script through shellcheck and fixed errors. Also cleaned up a bit.

Removed ionice support. Will reintroduce if procd adds support.

Removed config_overwrite debugging variable. No need for it.

Enabled TLS verify by default. Added a dependancy to ca-bundle as a result. This is a default in current trunk.

Signed-off-by: Rosen Penev <rosenp@gmail.com>