In b/297952359 we are seeing that widgets with clipped outline
elements end up showing shadows below their drag view. Which
due to not maintaining clipping looks further bad.
It seems like, we don't really need the elevation for drag
view anymore - and presumably it was added for older android
versions for shadow for folders. But, they don't have them
anymore, so, removing elevation now.
Note: The issue that during drag and drop, the dragged preview
not showing clip to outline or shadows within widget's views is
a separate issue related to the Picture API usage during drag
and drop.
Bug: 297952359
Test: Screen record in comments
Flag: EXEMPT Bugfix
Change-Id: If31a0275938afe374d269a46cc950970033323f9
Shamali P
cc21323af2