Factory restart.sh: Simplify setsid call

* Doesn't need to be backgrounded when in a script.

BUG=chrome-os-partner:5793
TEST=restart successfully from factory sw, restart from commandline

Change-Id: Ic9385f463601f72129762f82123664ff99b53a79
Reviewed-on: http://gerrit.chromium.org/gerrit/7237
Tested-by: Nick Sanders <nsanders@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed