org-latex: org-export-latex-format-image now accepts optional shortname

* lisp/org-latex.el (org-export-latex-format-image): updated number of
  arguments to allow for an optional short-name

lisp/org-latex.el

@@ -1894,7 +1894,7 @@ The conversion is made depending of STRING-BEFORE and STRING-AFTER."
 	     (t (insert "\\texttt{" desc "}")))))))
 
 
-(defun org-export-latex-format-image (path caption label attr)
+(defun org-export-latex-format-image (path caption label attr &optional shortn)
   "Format the image element, depending on user settings."
   (let (ind floatp wrapp multicolumnp placement figenv)
     (setq floatp (or caption label))