OO-2363: export only configured columns (patch S. Clemenz)

src/main/java/org/olat/core/gui/components/form/flexible/impl/elements/table/ExportableFlexiTableDataModelDelegate.java

@@ -53,7 +53,7 @@ public class ExportableFlexiTableDataModelDelegate  {
 		List<FlexiColumnModel> columns = new ArrayList<>(numOfColumns);
 		for(int i=0; i<numOfColumns; i++) {
 			FlexiColumnModel column = columnModel.getColumnModel(i);
-			if((column.isDefaultVisible() || tableEl.isColumnModelVisible(column)) && column.isExportable()) {
+			if((tableEl.isColumnModelVisible(column)) && column.isExportable()) {
 				columns.add(column);
 			}
 		}