Listen page: Audio events query trims results!

[atruskie]

The audio events API has recently been upgraded to use the new API model. Unfortunately now the default paging size of 25 items per request is now in effect. This means that when there is many annotations on a page only the first 25 are shown.

Very confusing to users - they think their annotations are lost.

Fix: get the filter query to automatically load all events by paging through the result sets if a there are multiple pages of results.

Reported by @KarlinaInd