Use active layer and label for live wire
Summary:
Check for labelsetimage and use the correct pixel value
The tool has to check for the active layer and label to retrieve the correct pixel value.
Make sure the code of different tools is consistent
Test Plan: manual GUI testing
Reviewers: thomass, O1 MITK Reviewer Group I, floca, O3 MITK Reviewer Group II
Reviewed By: O1 MITK Reviewer Group I, floca, O3 MITK Reviewer Group II
Subscribers: floca, thomass, kalali
Maniphest Tasks: T27817
Differential Revision: https://phabricator.mitk.org/D447