Fix more 'cpo' issues in runtime files.
diff --git a/runtime/ftplugin/art.vim b/runtime/ftplugin/art.vim
index cb95e6b..c501a99 100644
--- a/runtime/ftplugin/art.vim
+++ b/runtime/ftplugin/art.vim
@@ -12,5 +12,4 @@
 run ftplugin/lisp.vim
 
 setl lw-=if
-setl lw+=def-art-fun,deffacts,defglobal,defrule,defschema,
-      \for,schema,while
+setl lw+=def-art-fun,deffacts,defglobal,defrule,defschema,for,schema,while