Revert "vtkModule: fix typo for `REQUEST_MODULES` argument handling"

Ben Boeckelrequested to merge
ben.boeckel/vtk:revert-dashboard-breakage into master

Why this unbreaks things, I don't know. More debugging will be required. But in the meantime, let's unbreak master.

This reverts commit 1cb86e77.

Cc: @utkarsh.ayachit @brad.king @yohann.bearzi @seanm

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