Export File as bug for markup control points

This replicates in the latest preview (and current stable).

Create a pointList object with some markups in. Set the interaction lock for the control point addition (so that no new control points can be added to the pointList).

Save the pointList as a mrk.json via regular save as menu, and also a second time via Export File As under a different filename.

Reset the scene and load both mrk.json files into the scene. Observe the lock state is preserved in normal save as, but not in export file as.

This breaks our functionality (and tutorials) for landmark templates, when the template is saved via export file as.

@smrolfe @lassoan

Good catch, fixed - BUG: Fix fixedNumberOfControlPoints property value in exported markup… · Slicer/Slicer@38d8d99 · GitHub