/**
 * Hide password protected posts, for non-admins, in the case of 'edit-post' screen id
 */
add_action( 'pre_get_posts', function( WP_Query $q )
{
    $screen = get_current_screen();

    if(    is_admin()
        && ! current_user_can( 'manage_options' )
        && is_a( $screen, WP_Screen )
        && 'edit-post' === $screen->id
    )
        $q->set( 'has_password', false );
} );