fix(test_from_matrix): assume max precision

When converting to matrix back and forth, coordinates appear to be
rounded to a precision of 1e-8. This causes sporadic failures in said
test.

For this test it should be assumed that the coordinates of arr can be
described with said precision.

tests/test_quaternion.py

@@ -126,6 +126,9 @@ def test_matrix(self, arr):
     @given(ANY_QUATERNION)
     def test_from_matrix(self, arr):
         assume(GeneralQuaternion(*arr).norm() > DEFAULT_TOLERANCE)
+        EXP = - int(np.log10(DEFAULT_TOLERANCE))
+        for coordinate in Quaternion(*arr).coordinates:
+            assume(coordinate == round(coordinate, EXP))
         q = Quaternion(*arr)
         assert q.from_matrix(q.matrix) == q