Fix bug when exporing inactive timestamps.

* org-html.el (org-html-handle-time-stamps): fix bug when
exporing inactive timestamps.

lisp/org-html.el

@@ -2124,14 +2124,14 @@ But it has the disadvantage, that Org-mode's HTML conversions cannot be used."
 	(or b (setq b (substring s 0 (match-beginning 0))))
 	(setq r (concat
 		 r (substring s 0 (match-beginning 0))
-		 " @<span class=\"timestamp-wrapper\">"
+		 " <span class=\"timestamp-wrapper\">"
 		 (if (match-end 1)
-		     (format "@<span class=\"timestamp-kwd\">%s @</span>"
+		     (format "<span class=\"timestamp-kwd\">%s </span>"
 			     (match-string 1 s)))
-		 (format " @<span class=\"timestamp\">%s@</span>"
+		 (format " <span class=\"timestamp\">%s</span>"
 			 (substring
 			  (org-translate-time (match-string 3 s)) 1 -1))
-		 "@</span>")
+		 "</span>")
 	      s (substring s (match-end 0))))
       ;; Line break if line started and ended with time stamp stuff
       (if (not r)