Edit 3D view tool state is now always initialized to a stored
"no scene" state if one exists to ensure further scene changes
properly inherit the tool state in all cases.
Change-Id: Ifee5fe58255b51d9dbed57abb2020ea00d94af2c
Fixes: QDS-1750
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>