Use the updated vn_simona grid from SIMONA

[sebastian-peter]

          Note to myself: we should use the updated csv sources from https://github.com/ie3-institute/simona/pull/424 once they are final.

Originally posted by @sebastian-peter in #709 (comment)

[sebastian-peter]

We should make sure that the grid is fully validated, i.e. include changes from ie3-institute/simona#672