Settings: Move "Double-tap to sleep" option under Display settings

Change-Id: Ia97b9906b9d0e47080edc0ace16d4fb3c6bd56a2
Signed-off-by: scott <scott@ubuntu>
missed this change that was part of the quiet hours rewrite.  oops.

Change-Id: Ifc7bdaabb09f050b4ce34afc2bc90d561157234b
Signed-off-by: scott <scott@ubuntu>
oops

Change-Id: I4e0b33897bcd1a5ef7d068d911d58170e4adbd57
Signed-off-by: scott <scott@ubuntu>