[bugfix] remove redundant copyjacToNoGhost in ISTLSolverEbos::solve

It uses a null pointer and make flow segfault. The copying is already
done in ISTLSolverEbos::prepare.

opm/simulators/linalg/ISTLSolverEbos.hpp

@@ -517,7 +517,6 @@ protected:
 
                     typedef WellModelMatrixAdapter< Matrix, Vector, Vector, WellModel, true > Operator;
                     assert (noGhostMat_);
-                    copyJacToNoGhost(*matrix_, *noGhostMat_);
                     Operator opA(*noGhostMat_, wellModel,
                                  comm_ );