Fix up marker drag end event for detecting when the marker moves

rmo/template/nuisance.html

@@ -120,6 +120,7 @@ document.addEventListener('DOMContentLoaded', function() {
 		mapZoom.value = e.target.getZoom();
 	});
 	mapLocator.addEventListener("markerdragend", (e) => {
+		const marker = event.detail.marker;
 		const lngLat = marker.getLngLat();
 		//displaySelectedCoordinates(lngLat);
 		geocodeReverse(MAPBOX_ACCESS_TOKEN, lngLat);