fix customize layout sizing

public_includes/layout_bottom.ily

@@ -2,9 +2,7 @@ MUSIC = { \transposable #TRANSPOSITION \MUSIC }
 
 LAYOUT = \layout {
   \LAYOUT
-  #(let
-    ((custom-size (ly:output-def-lookup LAYOUT 'size #f)))
-    (if custom-size (layout-set-staff-size custom-size)))
+  #(customized-layout LAYOUT)
 }
 
 verselayout = \layout {