ROI extraction on multiple images: defined ROI should not be saved in the first selected object

[PierreRaybaut]

When extracting ROI from multiple images, only the first image is modified by adding a new ROI.

Expected behavior:

• All selected images should be modified the same way
• Either an ROI is created on all selected images, or no ROI is created on all selected images

[PierreRaybaut]

Design choice: the defined ROI is not saved, either in the first selected object only (as before, which was unexpected) or in any of the other objects.