Correct path
Summary: Path to CTestSubprojectList.cmake contains duplicate "Cmake/"
Test Plan: Covered by dartclients
Reviewers: O1 MITK Core, kislinsk
Reviewed By: O1 MITK Core, kislinsk
Subscribers: kislinsk
Maniphest Tasks: T27038
Differential Revision: https://phabricator.mitk.org/D240