Use a relative tolerance of 1e-2

Windows is producing slightly different results for the simulated
polar view, but it is small enough for a relative tolerance of 1e-2
to work fine.

The refined texture parameters come out very slightly different.
There are probably just some small nuance differences between
Windows and the other operating systems.

Signed-off-by: Patrick Avery <[email protected]>

Author: psavery

tests/test_wppf_texture.py

@@ -224,4 +224,4 @@ def test_wppf_texture(texture_instrument, texture_img_dict, test_data_dir):
         d2 = comparison_dict[root_key]
         assert sorted(list(d1)) == sorted(list(d2))
         for key in d1:
-            assert np.allclose(d1[key], d2[key], equal_nan=True, atol=1e-2)
+            assert np.allclose(d1[key], d2[key], equal_nan=True, rtol=1e-2)