openssh: fix tab/spacing in init script

Several of the lines in S50sshd script have a strange mix of spaces
and tabs, that at least do not look consistent with neighboring lines.
This patch makes the spacing consistent, and also strips the trailing
spaces.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>