Revert "Bypass the lockscreen when the hardware keyboard is slid out and security mode is 'none'"

This reverts commit c12204450f41eb3a6175b5fae7f1a853c059c6eb.
This bypasses the slider, which is undesirable.
If this behaviour is desired, set unlock type to "None" instead of
"Slide".

Change-Id: I41492b38bf9d19b47678e05bd1d77602b035cc74