Fix for multisite lost password link for dudestack sites

[lukanja]

Currently on multisites, if an user wants to request a new password from domains other than the main site, the url gets formatted weirdly leading to 404-error.

Can be fixed using the lostpassword_url hook:

add_filter( 'lostpassword_url', __NAMESPACE__ . '\lost_password_url', 10, 2 );

An example of the function to pass (for development and production sites):

function lost_password_url( $lostpassword_url, $redirect ) {
  // On main site no need to do anything

  if ( get_main_site_id() === get_current_blog_id() ) {
    return $lostpassword_url;
  }

  if ( 'development' === getenv( 'WP_ENV' ) ) {
    $lostpassword_url = get_home_url() . '/wp-login.php?action=lostpassword';
    return $lostpassword_url;
  } else {
    $lostpassword_url = get_home_url() . '/wp/wp-login.php?action=lostpassword';
    return $lostpassword_url;
  }
}