Change count of "spaces" for calendar tooltip to number of total tickets available before any sales. Event Espresso 4

calendar_spaces_left.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

function ee_change_calendar_spaces_left(
    $text,
    $datetime
) {
    $text = $datetime->sum_tickets_initially_available();
    return $text;
}
add_filter(
    'FHEE__EE_Calendar__tooltip_datetime_available_spaces',
    'ee_change_calendar_spaces_left',
    10,
    2
);