fix memory leak in Query widget when refresh rate is set
fix memory leak in Query widget when refresh rate is set

Esri/arcgis-viewer-flex,Esri/arcgis-viewer-flex,CanterburyRegionalCouncil/arcgis-viewer-flex,CanterburyRegionalCouncil/arcgis-viewer-flex,CanterburyRegionalCouncil/arcgis-viewer-flex