[dashboards] Dicom warnings

on paraview-branch-master-[windows_vs2019_kits_mpi_python_qt] and paraview-branch-master-[windows_vs2019_qt]

https://open.cdash.org/viewBuildError.php?type=1&buildid=7115372

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29333\include\utility(190): warning C4244: 'initializing': conversion from 'DICOMParser::VRTypes' to '_Ty2', possible loss of data

        with
        [
            _Ty2=DICOMTypeValue
        ]
..\VTK\Utilities\DICOMParser\DICOMParser.cxx(525): note: see reference to function template instantiation 'std::pair<const DICOMMapKey,DICOMTypeValue>::pair<DICOMMapKey,DICOMParser::VRTypes&,0>(_Other1 &&,_Other2) noexcept' being compiled
        with
        [
            _Other1=DICOMMapKey,
            
_Other2=DICOMParser::VRTypes &
        ]

Edited Mar 23, 2021 by Mathieu Westphal

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