corrected a data type error for sql select

shared/code/tce_functions_test_stats.php

@@ -1279,7 +1279,7 @@ function F_getTestIDs($test_id, $user_id, $filter='test_results_to_users') {
 	$str = '0'; // string to return
 	$test_id = intval($test_id);
 	$user_id = intval($user_id);
-	$sql = 'SELECT test_id FROM '.K_TABLE_TESTS.' WHERE test_id IN (SELECT DISTINCT testuser_test_id FROM '.K_TABLE_TEST_USER.' WHERE testuser_user_id='.intval($user_id).' AND testuser_status>0) AND '.$filter.'=1';
+	$sql = 'SELECT test_id FROM '.K_TABLE_TESTS.' WHERE test_id IN (SELECT DISTINCT testuser_test_id FROM '.K_TABLE_TEST_USER.' WHERE testuser_user_id='.intval($user_id).' AND testuser_status>0) AND '.$filter.'= TRUE';
 	if ($r = F_db_query($sql, $db)) {
 		while ($m = F_db_fetch_assoc($r)) {
 			$str .= ','.$m['test_id'];