Fixed app-schema filtering

MappingFeatureIteratorFactory.getInstance was changing the filter of the query that was passed in and as a result a given FeatureCollection would only work correctly once.  This change makes a copy of the passed in query before updating it.

modules/extension/app-schema/app-schema/src/main/java/org/geotools/data/complex/MappingFeatureIteratorFactory.java

@@ -103,8 +103,9 @@ public boolean isListFilterExists() {
     }
 
     public static IMappingFeatureIterator getInstance(AppSchemaDataAccess store,
-            FeatureTypeMapping mapping, Query query, Filter unrolledFilter) throws IOException {
+            FeatureTypeMapping mapping, Query rawQuery, Filter unrolledFilter) throws IOException {
 
+    	Query query = new Query(rawQuery);
         if (mapping instanceof XmlFeatureTypeMapping) {
             return new XmlMappingFeatureIterator(store, mapping, query);
         }