Apply levelwindow preset regardless of current scale range
Summary: Removed some logic that adapts a levelwindow preset to the current scale range, i.e. making it smaller to fit within the borders. Instead, now the level and window are just set exactly as specified by the preset, increasing the scale range if necessary. Solves T28783
Test Plan: Load an image (e.g. brain.nrrd), select a levelwindow preset that stretches beyond the current scale range (i.e. air). Result: the levelwindow ends up as defined in the preset
Reviewers: O3 MITK Reviewer Group II, kislinsk
Reviewed By: O3 MITK Reviewer Group II, kislinsk
Differential Revision: https://phabricator.mitk.org/D565