settings: save default profile only in per-app mode

Fix also the IO-Scheduler here, which was broken.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
shell: fix NPE in workqueues

If no parameters were set, we could get a null pointer.
Just echo once should helping here out.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>