org-latex.el: Fix bug in setting the export directory according to the LaTeX options.

* org-latex.el (org-export-as-latex): Fix bug in setting the
export directory according to the LaTeX options.

Thanks to A. Major for reporting this and to Christian Moe for suggesting a
fix.

lisp/org-latex.el

@@ -855,7 +855,7 @@ when PUB-DIR is set, use this as the publishing directory."
 	       (concat
 		(file-name-as-directory
 		 (or pub-dir
-		     (org-export-directory :LaTeX ext-plist)))
+		     (org-export-directory :LaTeX org-export-latex-options-plist)))
 		(file-name-sans-extension
 		 (or (and subtree-p
 			  (org-entry-get rbeg "EXPORT_FILE_NAME" t))