Partially revert previous commit

Author: sebastianbergmann

.github/workflows/ci.yaml

@@ -102,7 +102,7 @@ jobs:
 
     env:
       PHP_EXTENSIONS: none, ctype, curl, dom, json, libxml, mbstring, openssl, phar, tokenizer, xml, xmlwriter
-      PHP_INI_VALUES: memory_limit=-1, zend.assertions=1, error_reporting=-1, log_errors_max_len=0, display_errors=On, display_startup_errors=On
+      PHP_INI_VALUES: memory_limit=-1, zend.assertions=1, error_reporting=-1, log_errors_max_len=0, display_errors=On
 
     strategy:
       fail-fast: false