gluon-status-page-api: decrease dyn/statistics event frequency

The statistics data is now cached for 5s, no need to send an event every
second. The new interval is 3s, which is coprime with the cache timeout.

package/gluon-status-page-api/files/lib/gluon/status-page/www/cgi-bin/dyn/statistics

@@ -2,4 +2,4 @@
 
 echo "Access-Control-Allow-Origin: *"
 
-exec gluon-neighbour-info -s "" -l -d ::1 -p 1001 -t 1 -r statistics
+exec gluon-neighbour-info -s "" -l -d ::1 -p 1001 -t 3 -r statistics