fix: add missing parameter to query

Fixes #70

src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseInputStreamFactory.java

@@ -155,7 +155,7 @@ protected Stream<T> obtainDataStream(DataProvider<T, ?> dataProvider) {
               exporter.grid.getDataProvider().size(new Query(filter)),
               exporter.grid.getDataCommunicator().getBackEndSorting(),
               exporter.grid.getDataCommunicator().getInMemorySorting(),
-              null);
+              filter);
       dataStream = getDataStream(streamQuery);
     }
     return dataStream;