[pnm][spatialparams] remove pnm prefix / superfluous Dumux::

dumux/material/spatialparams/porenetwork/porenetwork1p.hh

dumux/material/spatialparams/porenetwork/porenetwork2p.hh

dumux/material/spatialparams/porenetwork/porenetworkbase.hh

dumux/porenetwork/1p/model.hh

dumux/porenetwork/1p/spatialparams.hh

dumux/porenetwork/1pnc/model.hh

dumux/porenetwork/2p/model.hh

dumux/porenetwork/2p/spatialparams.hh

dumux/porenetwork/common/spatialparams.hh

examples/porenetwork_upscaling/properties.hh

examples/porenetwork_upscaling/spatialparams.hh

test/porenetwork/1p/noncreepingflow/properties.hh

test/porenetwork/1p/noncreepingflow/spatialparams.hh

test/porenetwork/1p/properties.hh

test/porenetwork/1pnc/properties.hh

test/porenetwork/1pnc/spatialparams.hh

test/porenetwork/2p/properties.hh

test/porenetwork/2p/spatialparams.hh