Renaming a fiducial list does not rename the corresponding ROI.

[allemangD]

Steps to reproduce:

1. Open PickAndPaint; select a model.
2. Add a new fiducial list (MarkupsFiducial)
3. Rename that fiducial list (Alpha)
4. Open Models module, select the model.
5. View model scalars; the scalar will still be called Model_MarkupsFiducial_ROI, rather than Model_Alpha_ROI.

Discovered while investigating #16.