babel: `org-babel-get-colnames' no longer requires hline

contrib/babel/lisp/org-babel.el

@@ -666,7 +666,7 @@ Return a list (session vars result-params result-type colnames rownames)."
         column names"
   (if (equal 'hline (second table))
       (cons (cddr table) (car table))
-    (list table)))
+    (cons (cdr table) (car table))))
 
 (defun org-babel-get-rownames (table)
   "Return a cons cell, the `car' of which contains the TABLE less