Allow pixels on c.secure pageviews.

The pixel system is now HTTPS-ready so we can use pixels safely on
c.secure requests.

r2/r2/templates/base.html

@@ -83,7 +83,7 @@
 </%def>
 
 <%def name="head()">
-%if g.tracker_url and thing.site_tracking and not c.secure:
+%if g.tracker_url and thing.site_tracking:
 <script type="text/javascript">
     (function() {
         var url = '${tracking.get_pageview_pixel_url()}';