Fix/remove film-on-substate-deformation.parset

@osander: Can you have a look?

This removes the film-on-substate-deformation.parset. Actually you were right and this experiment can be done using film-on-substrate from dune-gfe.

Also, this MR corrects the path to the Dirichlet-Values-File: Before, the parameter "problem" was appended by "-dirichlet-values", so "wriggers-l-shape" became "wriggers-l-shape-dirichlet-values". Now, as the Dirichlet-Values-File was renamed to "identity-deformation.py" in 3c22e194, the parameter does not need to be appended anymore.