Fixes bad_cast issue in P2P1ElementwiseBlendingStokesOperator

Marcus Mohrrequested to merge
mohr/fixBadCast into master

The sub-operators of P2ElementwiseBlendingVectorLaplaceOperator are of type P2ElementwiseBlendingLaplaceOperator and not P2ElementwiseLaplaceOperator.

Maybe it would be wiser to cast to P2ElementwiseBlendingVectorLaplaceOperator::scalarOpType.

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