Livetable does not fire event specific to the livetable id when new results are received

If the livetable gets new results to be displayed, it fires a "xwiki:livetable::receivedEntries event.
It is also supposed to fire a more specific xwiki:livetable:<table-id>:receivedEntries event, but instead fires a xwiki:livetable:undefined:receivedEntries.

This is a typo in livetable.js, easily fixed.