Fix private tag parsing in query files.
Fix private tag parsing in query files.

Ever since Jan 21, 2015 (versions 0.6.0 through 0.6.4) the query
file was unable to parse [PRIVATE_CREATOR]GGGG,EEEE private tags.

dgobbi/vtk-dicom,dgobbi/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom