Set access check to FALSE for entityQuery of user in user_is_blocked function

Problem/Motivation

There is no need to check access for entityQuery of user in user_is_blocked function.

Under normal circumstances, it's OK with access check. But for some reason, like if you install group module, it will alter the query by checking the current user's group permissions. Finally, it cannot find any blocked user if the blocked user belong to any group.
So it will let the blocked user login successfully and later logout him when user login Drupal.

Proposed resolution

Set access check to FALSE for entityQuery of user in user_is_blocked function

function user_is_blocked($name) {
  return (bool) \Drupal::entityQuery('user')
    ->accessCheck(FALSE)
    ->condition('name', $name)
    ->condition('status', 0)
    ->execute();
}