Fixed missing an @OverRide annotation

Author: alanmcdade

geowebcache/s3storage/src/main/java/org/geowebcache/s3/delete/DeleteTileLayer.java

@@ -31,6 +31,7 @@ public String getPrefix() {
         return prefix;
     }
 
+    @Override
     public String path() {
         return path;
     }