Add "Enable Widgets" option and fix "Make Gesture Visible."

The "Enable Widgets" option should show up under gesture unlock. And by
default, the "Make Gesture Visible" option is enabled, but the first
time it's set up, the setting shows up unchecked, even though it's
enabled.

Change-Id: Ifc92757343212e2841e8931a8fd45b8c4c16452b