use request.scheme for the flattr js too

ddportfolioservice/templates/base.mako

@@ -37,7 +37,7 @@ License along with this program.  If not, see
 	var flattr_url = '${request.scheme}://portfolio.debian.net/';
 	var flattr_btn='compact';
 </script>
-<script src="http://api.flattr.com/button/load.js" type="text/javascript"></script></p>
+<script src="${request.scheme}://api.flattr.com/button/load.js" type="text/javascript"></script></p>
     </div>
     <div id="content">
       ${self.body()}