Fix broken links on View Issues page

The print reports, csv and excel export buttons are missing the `?` in
the URL before the query parameters.

Regression introduced in 2.20.0 by 0127d16.

Fixes #25697

view_all_inc.php

@@ -115,7 +115,8 @@
 			if( empty( $t_filter_param ) ) {
 				$t_summary_link = 'view_all_set.php?summary=1&temporary=y';
 			} else {
-				$t_summary_link = 'summary_page.php?' . $t_filter_param;
+				$t_filter_param = '?' . $t_filter_param;
+				$t_summary_link = 'summary_page.php' . $t_filter_param;
 			}
 			# -- Print and Export links --
 			print_small_button( 'print_all_bug_page.php' . $t_filter_param, lang_get( 'print_all_bug_page_link' ) );