Settings: add key to USB Storage Unmount option

If we want to be able to highlight this preference and we need a key to do so.

Change-Id: I8c78f8cf8e75bbc071438ef4f733f3ac49e27791
Signed-off-by: Roman Birg <roman@cyngn.com>
Settings: Fix alignment of print settings icon

In case the print header row was not used for an account row before,
the print icon appeared shifted to the left.

Change-Id: Ieeafca0c16083f4a45b57a1015bb412da26bb0e9