Fix/SW-933 incorrect ratecode when creating booking as a member
* fix(SW-933): Added check if member to select correct rate code in create booking
* fix(SW-933): set member price in summary when "join" is true
* fix(SW-933): change "price" -> "amount" and fix bool expression
* fix(SW-933): added check for membership number in summary
Approved-by: Christel Westerberg
