Update ss7 URL (#629)

Author: sclaridge

raster/apply-mosaic-rule-to-rasters/src/main/java/com/esri/samples/apply_mosaic_rule_to_rasters/ApplyMosaicRuleToRastersSample.java

@@ -94,7 +94,7 @@ public void start(Stage stage) {
 
       // create a raster layer from the image service raster
       ImageServiceRaster imageServiceRaster = new ImageServiceRaster(
-        "https://sampleserver7.arcgisonline.com/arcgis/rest/services/amberg_germany/ImageServer");
+        "https://sampleserver7.arcgisonline.com/server/rest/services/amberg_germany/ImageServer");
       RasterLayer rasterLayer = new RasterLayer(imageServiceRaster);
 
       // add a raster layer as an operational layer to the map