[skip ci] Fix #[DelayedTargetValidation]+preloading test in file cache job

opcache.file_cache_only=1 implicitly disables preloading, keeping the preloaded
symbols from being declared.

Author: iluuu1994

Zend/tests/attributes/delayed_target_validation/opcache_validator_errors.phpt

@@ -4,6 +4,7 @@
 opcache.enable=1
 opcache.enable_cli=1
 opcache.preload={PWD}/opcache_validator_errors.inc
+opcache.file_cache_only=0
 --EXTENSIONS--
 opcache
 --SKIPIF--