[example]fix示例url

Author: chenxianhuii

examples/maplibregl/imageService.html

@@ -359,7 +359,7 @@ <h4 class="modal-title" id="myModalLabel"></h4>
             widgets.loader.showLoader("data loading...");
             var host = window.isLocal ? window.server : 'https://iserver.supermap.io';
             var root = 'https://iserver.supermap.io/iserver/services/imageservice-hainan/restjsr';
-            var url = host + '/iserver/services/data-china/rest/data';
+            var url = host + '/iserver/services/data-china400/rest/data';
             var attribution =
                 "<a href='https://www.maplibre.com/about/maps/' target='_blank'>© maplibre </a>" +
                 "with <span>© <a href='https://iclient.supermap.io' target='_blank'>SuperMap iClient</a> | </span>" +