SAM tool Reset old preview before setting new geomtery
Summary: Resets any preview segmentation when working plane geometry is changed.
Test Plan: NA
Reviewers: floca, O1 MITK Reviewer Group I
Reviewed By: floca, O1 MITK Reviewer Group I
Maniphest Tasks: T30403
Differential Revision: https://phabricator.mitk.org/D937