Fixing low res folder icon when preview changes

Also removing legacy for drawable sharing between folder-content and folder-icon, since preview now always creates new drawables

Flag: EXEMPT bugfix
Bug: 386842651
Test: atest PreviewItemManagerTest
Change-Id: Ib8e4b4d5be4fb0c9601b9d8e3cef8a29d6c77651
6 files changed