Fix error for excel export page

Fix an error introduced by commit f233869, that makes
excel_xml_export.php throw an error when exporting issues.

Issue #20424

Signed-off-by: Damien Regad <dregad@mantisbt.org>

excel_xml_export.php

@@ -134,7 +134,7 @@
 	# convert and cache data
 	$t_rows = filter_cache_result( $t_read_rows, $t_bug_id_array );
 	user_cache_array_rows( $t_unique_user_ids );
-	columns_plugin_cache_issue_data( $t_result, $t_columns );
+	columns_plugin_cache_issue_data( $t_rows, $t_columns );
 
 	# Clear arrays that are not needed
 	unset( $t_read_rows );