[dashboard] unreferenced formal parameter 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
..\Qt\ApplicationComponents\pqDefaultContextMenu.cxx(698): warning C4100: 'flatIndex': unreferenced formal parameter
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