[porousmediumflow] replace typedef by using

dumux/porousmediumflow/1p/model.hh

dumux/porousmediumflow/1p/sequential/celldata.hh

...diumflow/1p/sequential/diffusion/cellcentered/pressure.hh

.../1p/sequential/diffusion/cellcentered/pressurevelocity.hh

...diumflow/1p/sequential/diffusion/cellcentered/velocity.hh

dumux/porousmediumflow/1p/sequential/diffusion/problem.hh

dumux/porousmediumflow/1p/sequential/fluxdata.hh

dumux/porousmediumflow/1pncmin/implicit/model.hh

dumux/porousmediumflow/1pncmin/implicit/propertydefaults.hh

dumux/porousmediumflow/2p/gridadaptindicator.hh

dumux/porousmediumflow/2p/griddatatransfer.hh

dumux/porousmediumflow/2p/indices.hh

dumux/porousmediumflow/2p/model.hh

dumux/porousmediumflow/2p/sequential/celldata.hh

dumux/porousmediumflow/2p/sequential/celldataadaptive.hh

...diumflow/2p/sequential/diffusion/cellcentered/pressure.hh

.../2p/sequential/diffusion/cellcentered/pressureadaptive.hh

.../2p/sequential/diffusion/cellcentered/pressurevelocity.hh

...diumflow/2p/sequential/diffusion/cellcentered/velocity.hh

.../2p/sequential/diffusion/cellcentered/velocityadaptive.hh