[webui] reload the EPG store on "dvrdb" notifications

This way the DVR status icon gets updated correctly when a recording changes
state

src/webui/static/app/epg.js

@@ -295,6 +295,14 @@ tvheadend.epg = function() {
                 name: 'serieslink'
             }])
     });
+
+    /**
+     * Listener for DVR notifications. We want to update the EPG grid when a 
+     * recording is finished/deleted etc. so the status icon gets updated.
+     */
+    tvheadend.comet.on('dvrdb', function() {
+        epgStore.reload();
+    });
 
     function setMetaAttr(meta, record) {
         var now = new Date;