Fix ghost element test
Unfortunately the test doesn't run in any CI configuration. For me the new reference file Tests/Data/EllipticPETSc/square_1e1_neumann_ts_1_t_1_000000.vtu
looks plausible.
Unfortunately the test doesn't run in any CI configuration. For me the new reference file Tests/Data/EllipticPETSc/square_1e1_neumann_ts_1_t_1_000000.vtu
looks plausible.