fix: fix sorting issue in docx & pdf exports

Fix sorting issue by using the correct variable when exporting the rows

Fixes #28

Author: mlopezFC

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

@@ -153,7 +153,7 @@ private void fillData(XWPFTable table, XWPFTableCell dataCell, DataProvider<T, ?
     dataStream.forEach(t -> {
       XWPFTableRow currentRow = startingCell[0].getTableRow();
       if (!firstRow[0]) {
-        currentRow = table.insertNewTableRow(dataCell.getTableRow().getTable().getRows().indexOf(dataCell.getTableRow())+1);
+        currentRow = table.insertNewTableRow(dataCell.getTableRow().getTable().getRows().indexOf(startingCell[0].getTableRow())+1);
         Iterator<Column<T>> iterator = exporter.columns.iterator();
         while (iterator.hasNext()) {
           iterator.next();