Staff price not counted when multiple staff automatically assigned

[Valentina R]

When the product has the 'Automatically assigned (all staff together)' option, the staff's 'Additional cost' is not being added to the total price.

Reported here: https://bookingwp.com/forums/topic/multiple-staff-appointed-problem-with-gcal-sync-or-additional-cost/#post-197452

Can be reproduced here(second staff has additional price of 100€): https://fable.valentina-rakar.com/product/harald-2-staff-together/?date=2019-04-15&time=0600

[Željan Topić]

Fixed with 4.4.7