org-mime.el: Correct element matching regex

* org-mime.el (org-mime-change-element-style): Correctly capture the
  HTML element instead of partially.

Passing element of "p" would end up matching and altering "pre"
elements as well.  Need to properly anchor the regex to HTML elements.

TINYCHANGE

contrib/lisp/org-mime.el

@@ -111,7 +111,7 @@
 ;; example hook, for setting a dark background in <pre style="background-color: #EEE;"> elements
 (defun org-mime-change-element-style (element style)
   "Set new default htlm style for <ELEMENT> elements in exported html."
-  (while (re-search-forward (format "<%s" element) nil t)
+  (while (re-search-forward (format "<%s\\>" element) nil t)
     (replace-match (format "<%s style=\"%s\"" element style))))
 
 (defun org-mime-change-class-style (class style)