Fix PHPCS (#8719)

Author: driusan

php/libraries/SinglePointLogin.class.inc

@@ -178,7 +178,7 @@ class SinglePointLogin
         // First try JWT authentication, which is cheaper and
         // doesn't involve database calls
         $headers    = getallheaders();
-        $headers = array_change_key_case($headers, CASE_LOWER);
+        $headers    = array_change_key_case($headers, CASE_LOWER);
         $authHeader = isset($headers['authorization'])
                          ? $headers['authorization']
                          : '';