Update downscaler defaults to account for rfactor < 1

vsaa/funcs.py

@@ -397,7 +397,8 @@ def based_aa(
         aaw, aah = [(round(r * rfactor) + 1) & ~1 for r in (ss_clip.width, ss_clip.height)]
 
         if downscaler is None:
-            if (aaw / func.work_clip.width).is_integer() and (aah / func.work_clip.height).is_integer():
+            if ((max(aaw, func.work_clip.width) / min(aaw, func.work_clip.width)).is_integer() and
+                (max(aah, func.work_clip.height) / min(aah, func.work_clip.height)).is_integer()):
                 downscaler = Box
             else:
                 downscaler = Catrom