[test][poroelastic] use higher zero threshold

test/multidomain/poromechanics/el1p/CMakeLists.txt

@@ -10,4 +10,5 @@ dune_add_test(NAME test_md_poromechanics_el1p
                                 ${CMAKE_SOURCE_DIR}/test/references/test_md_poromechanics_el1p_poroelastic-reference.vtu
                                 ${CMAKE_CURRENT_BINARY_DIR}/test_md_poromechanics_el1p_poroelastic-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_md_poromechanics_el1p params.input
-                       -Vtk.OutputName test_md_poromechanics_el1p")
+                                                              -Vtk.OutputName test_md_poromechanics_el1p"
+                       --zeroThreshold {"u":1e-14})

test/multidomain/poromechanics/el2p/CMakeLists.txt

@@ -11,4 +11,5 @@ dune_add_test(NAME test_md_poromechanics_el2p
                                 ${CMAKE_SOURCE_DIR}/test/references/test_md_poromechanics_el2p_poroelastic-reference.vtu
                                 ${CMAKE_CURRENT_BINARY_DIR}/test_md_poromechanics_el2p_poroelastic-00010.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_md_poromechanics_el2p params.input
-                       -Vtk.OutputName test_md_poromechanics_el2p")
+                                                              -Vtk.OutputName test_md_poromechanics_el2p"
+                       --zeroThreshold {"u":1e-14})