Mark preloading test as opcache.file_cache_only=0

Preloading requires shm.

Author: iluuu1994

Zend/tests/partial_application/preloading.phpt

@@ -4,6 +4,7 @@ PFA preloading
 opcache.enable=1
 opcache.enable_cli=1
 opcache.preload={PWD}/preloading.inc
+opcache.file_cache_only=0
 --SKIPIF--
 <?php
 if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');