Fix minor yamllint issue (#268)

Fix indentation to make yamllint happy.

Signed-off-by: SuperQ <[email protected]>

Author: SuperQ

web/testdata/web_config_auth_client_san.good.yaml

@@ -4,6 +4,6 @@ tls_server_config:
   client_auth_type: "RequireAndVerifyClientCert"
   client_ca_file: "client2_selfsigned.pem"
   client_allowed_sans:
-     - "one"
-     - "test3"
-     - "two"
+    - "one"
+    - "test3"
+    - "two"