ox: Fix 8c833ed9fbabae298054dd9eec574984acf3ab8b

* lisp/ox.el (org-export-table-cell-alignment): Use correct :test.
  See 2baa2c3afa70f86a6266b4bb9d5f763c5fb18388.

lisp/ox.el

@@ -4523,7 +4523,7 @@ Possible values are `left', `right' and `center'."
 	 (cache (or (plist-get info :table-cell-alignment-cache)
 		    (plist-get (setq info
 				     (plist-put info :table-cell-alignment-cache
-						(make-hash-table :test 'equal)))
+						(make-hash-table :test 'eq)))
 			       :table-cell-alignment-cache)))
 	 (align-vector (or (gethash table cache)
 			   (puthash table (make-vector columns nil) cache))))