org-e-latex: Correctly export statistics cookies with percents

* contrib/lisp/org-e-latex.el (org-e-latex-statistics-cookie): Protect
  percents in statistics cookies.

contrib/lisp/org-e-latex.el

@@ -2124,7 +2124,8 @@ contextual information."
 (defun org-e-latex-statistics-cookie (statistics-cookie contents info)
   "Transcode a STATISTICS-COOKIE object from Org to LaTeX.
 CONTENTS is nil.  INFO is a plist holding contextual information."
-  (org-element-property :value statistics-cookie))
+  (replace-regexp-in-string
+   "%" "\\%" (org-element-property :value statistics-cookie) nil t))
 
 
 ;;;; Strike-Through