fix an egregious oversight and add pav to the credits

browser/base/content/credits.xhtml

@@ -276,6 +276,7 @@
             <li>Robert O'Callahan</li>
             <li>Mats Palmgren</li>
             <li>Simon Paquet</li>
+            <li>Stuart Parmenter</li>
             <li>Jay Patel</li>
             <li>Igor Pavlov, 7-Zip</li>
             <li>Chase Phillips</li>