message: fix MoveToDense generic matrix test
  The stride requirements are incorrect
diff: @@ -1074,30 +1074,13 @@ TYPED_TEST(Matrix, MoveToDenseIsEquivalentToRef)
  using Mtx = typename TestFixture::Mtx;
  using Dense = gko::matrix::Dense<typename Mtx::value_type>;
  this->forall_matrix_scenarios([&](auto mtx) {
  - const auto size = mtx.ref->get_size();
  - const auto stride = size[1] + 5;
  - const auto padded_size = gko::dim<2>{size[0], stride};
  - auto ref_padded = Dense::create(this->ref, padded_size);
  - auto dev_padded = Dense::create(this->exec, padded_size);
  - ref_padded->fill(12345);
  - dev_padded->fill(12345);
  - const auto rows = gko::span{0, size[0]};
  - const auto cols = gko::span{0, size[1]};
  - const auto pad_cols = gko::span{size[1], stride};
  - auto ref_result = ref_padded->create_submatrix(rows, cols);
  - auto dev_result = dev_padded->create_submatrix(rows, cols);
  - auto ref_padding = ref_padded->create_submatrix(rows, pad_cols);
  - auto dev_padding = dev_padded->create_submatrix(rows, pad_cols);
  - auto orig_padding = ref_padding->clone();
  + auto ref_result = Dense::create(this->ref);
  + auto dev_result = Dense::create(this->exec);
  mtx.ref->move_to(ref_result.get());
  mtx.dev->move_to(dev_result.get());
  GKO_ASSERT_MTX_NEAR(ref_result, dev_result, 0.0);
  - ASSERT_EQ(ref_result->get_stride(), stride);
  - ASSERT_EQ(dev_result->get_stride(), stride);
  - GKO_ASSERT_MTX_NEAR(ref_padding, orig_padding, 0.0);
  - GKO_ASSERT_MTX_NEAR(dev_padding, orig_padding, 0.0);
  });
  }
  