BUG: fix (another) dialog parent for dicom stats
BUG: fix (another) dialog parent for dicom stats

Follow on to commit [1] to apply the same fix to another instance of the dialog.

Thanks to Csaba for catching this!

[1] https://github.com/commontk/CTK/commit/8a25a0628b72b04d2d6f5a0bebc18f6519fe2074
CJGoch/CTK,SINTEFMedtek/CTK,commontk/CTK,commontk/CTK,SINTEFMedtek/CTK,CJGoch/CTK,commontk/CTK,SINTEFMedtek/CTK,CJGoch/CTK,CJGoch/CTK,SINTEFMedtek/CTK,CJGoch/CTK,commontk/CTK,SINTEFMedtek/CTK