Fix unit test for FCC model to match corrected math.

Values given by Jonathan Gaudet. Note that more robuts testing would be useful and should be added in the future.

sasmodels/models/fcc_paracrystal.py

@@ -213,9 +213,10 @@ def random():
 #
 # October 26, 2022, PDB fixed unit tests to conform to new maths
 # TODO: fix the 2d tests
-q = 4.*pi/220.
+# Test position of first Bragg Peak at q = 2.0 * pi * np.sqrt(3) / (np.sqrt(2) * 220)
+q=0.035
 tests = [
-    [{}, [0.001, q, 0.25], [1.9839734995338474, 0.3352457353010224, 0.005804136688760973]],
+    [{}, [0.01, q, 0.25], [0.0213498915484313, 69.03586722100925, 0.005713137547083953]],
     #[{}, (-0.047, -0.007), 238.103096286],
     #[{}, (0.053, 0.063), 0.863609587796],
 ]