[WooCommerce Bookings] Make calendar default to first available booking

wc-bookings-bookings_calendar_default_to_first_available.php

/**
 * Will make the Bookings calender default to the month with the first available booking.
 */
add_filter( 'wc_bookings_calendar_default_to_current_date', '__return_false' );

Correct spelling of 'calender' to 'calendar' in

Will make the Bookings calender default to the month with the first available booking.