Revert "Specifies descendantFocusability to Folder view."

This reverts commit 878e8eef.

This change breaks folder panning while editing the folder name.
On mobile, open folder
  click on the folder name
     keyboard appears, launcher pans
  click back/close folder and click the folder name again
      keyboard appears, folder stays behind the keyboard

Change-Id: Ief977add004107d053b56dff18d222be9012706b