While we're at it, correct the values of some properties
we're setting on FolderListModel.
Task-number: QTBUG-87798
Pick-to: 6.3
Change-Id: I61d40c84e6ee8784cb2c27f90b6aaffc9976311c
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>