[cleanup] [test][md][stokesdarcy][1p2c] remove unused properties_stokes.hh

This is related to issue #1206 (closed)

What this MR does / why does DuMux need it:

Removed unused properties file 'properties_stokes.hh' as all properties of coupled problem are stored in 'properties.hh'.

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Edited by Ned Coltman

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