fixed twitter link to Berkeley Press Release

lms/templates/static_templates/press_releases/UC_Berkeley_joins_edX.html

@@ -100,7 +100,7 @@
         <div class="social-sharing">
         <hr class="horizontal-divider">
           <p>Share with friends and family:</p>
-          <a href="http://twitter.com/intent/tweet?text=UC+Berkeley+joins+Harvard+and+MIT+not-for-profit+online+learning+collaborative:+http://edx.org/press/uc-berkeley-joins-edx" class="share">
+          <a href="http://twitter.com/intent/tweet?text=UC+Berkeley+joins+Harvard+and+MIT+not-for-profit+online+learning+collaborative:+http://www.edx.org/press/uc-berkeley-joins-edx" class="share">
             <img src="${static.url('images/social/twitter-sharing.png')}">
           </a>
         </a>