message: Fix device mask.
diff: @@ -207,7 +207,7 @@ TEST_CASE("H1 Assembly Levels", "[AssemblyLevel], [PartialAssembly], [CUDA]")
  auto order = !all_tests ? GENERATE(2) : GENERATE(1, 2, 3);
  test_assembly_level("../../data/periodic-cube.mesh",
  order, q_order_inc, dg, pb, assembly);
  - if ( Device::Allows(Backend::CPU_MASK))
  + if ( !Device::Allows(~Backend::CPU_MASK) )
  {
  test_assembly_level("../../data/fichera-q3.mesh",
  order, q_order_inc, dg, pb, assembly);
  @@ -263,7 +263,7 @@ TEST_CASE("L2 Assembly Levels", "[AssemblyLevel], [PartialAssembly], [CUDA]")
  auto order = !all_tests ? 2 : GENERATE(1, 2, 3);
  test_assembly_level("../../data/periodic-cube.mesh",
  order, q_order_inc, dg, pb, assembly);
  - if ( Device::Allows(Backend::CPU_MASK))
  + if ( !Device::Allows(~Backend::CPU_MASK) )
  {
  test_assembly_level("../../data/fichera-q3.mesh",
  order, q_order_inc, dg, pb, assembly);
  