Add missing show_output to test after merge of e7462bf

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Author: bwoebi

ext/zend_test/tests/observer_frameless.phpt

@@ -4,6 +4,7 @@ Observer: Frameless calls are disabled when there are observers
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 --FILE--
 <?php
 function _strpos(string $str) {