fix SPLIT ordering

examples/list.vqe

@@ -1 +1 @@
-("test this" (*test*) ) pi cons 2 cons 1 cons 4 { split exch disp newline } repeat
+("test this" (*test*) ) pi cons 2 cons 1 cons 4 { split disp newline } repeat

varaq/interpreter.go

@@ -345,9 +345,10 @@ func Interpret(code Expr, argv []string, w io.Writer) error {
 			}
 			if list.Tok == LIST {
 				n := len(list.Exprs) - 1
-				push(list.Exprs[n])
+				e := list.Exprs[n]
 				list.Exprs = list.Exprs[:n]
 				push(list)
+				push(e)
 			} else {
 				return fmt.Errorf("cannot `split` not a list @%v", idx)
 			}