WorldClock:The Next icon is not working when search city on World clock

The Next icon is not working when search city on World clock

Change the Next icon to Done icon, when tap the Done icon, hide the
SoftInput.

CRs-Fixed: 655251

Change-Id: I40944db97cbd285f70556c0afb4dab9498221b19
DeskClock: Avoid DeskClock layout displays abnormally on landscape.

- ConfigChanges property for DeskClock activity won't let the activity
recreate and re-layout when rotating the device.
- Delete the activity property. Meanwhile, when the activity recreate
it will reset music seletion source to be zero which lead to the music
picker uri null. Save and restore the seletion before re-createing.

Change-Id: If680f0b262231cf3b8b7186c9dbacea7c0d1574e
CRs-Fixed: 655098