test_RefPat.py: Fix test from size difference

Refpat seems also sorted by size. Though I'm not sure which comes
first when both entries are at the same size.

For #41

guppy/heapy/test/test_RefPat.py

@@ -421,8 +421,13 @@ class A:
         gc.collect()
         rp = self.rp(dst, src, depth=10)
         rp.mod.View._is_clear_drg_enabled = 0  # Note Apr 19 2005
-        self.asis(rp.a.theone, b)
-        self.asis(rp.b.theone, a.__dict__)
+
+        if sys.getsizeof(b) > sys.getsizeof(a.__dict__):
+            self.asis(rp.a.theone, b)
+            self.asis(rp.b.theone, a.__dict__)
+        else:
+            self.asis(rp.a.theone, a.__dict__)
+            self.asis(rp.b.theone, b)
 
         # Test that the dict is eventually automatically removed from dictowners -
         # First test that dictowners is nonzero