better reusable block support

in reading-time-wp/rt-reading-time.php line 290 add :

	public function rt_add_reading_time_before_content( $content ) {
	if (!in_the_loop()) return $content;
	$rt_reading_time_options = get_option( 'rt_reading_time_options' );

so that reading time is not added in reusable blocks in the widget bar