1/ Set Swipe bottom for notification OFF by default

Note:
1) The "Swipe bottom for notification" will still available
   in Settings
2) If user had ever turn ON this settings, then we will NOT help
user change() any setting for this purpose.

Test: facory reset and observe the default function if OFF
Test: atest WMShellUnitTests
Bug: 182711813
Change-Id: Iaea9c31e263d4b86096aeecf5287c7c738a5c69e