Fix typo that prevented parsing PictureMarkerSymbols.
Fix typo that prevented parsing PictureMarkerSymbols.

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