Change cheapaml_mask_width from 5 to 4: previous edge width was 4 but in

 old setting was applied over mask_width-1

Author: jm-c

verification/cheapAML_box/input/data.cheapaml

@@ -2,7 +2,7 @@
 #--------------------
  &CHEAPAML_CONST
   cheapaml_ntim = 5,
-  cheapaml_mask_width=5,
+  cheapaml_mask_width=4,
   cheapaml_h = 1000.,
  &