Bug - make sure add and update functions create the correct object structure

[kelsey-21]

Currently adding a reservation results in an error message of
reservations.js?e62e:144 Uncaught (in promise) TypeError: Cannot read property 'numOfSeats' of undefined at eval (reservations.js?e62e:144)

likely due to the reservation creation/update flow no longer matching the data structure of the seed data.

[jacob-bw]

seed data json for reservations is currently structured as:
{
"reservation1": {
"seatingId": "",
"partySize": #,
"customerName": "",
"timeStamp": "0000-00-00 00:00",
"sectionId": ""
},

the function passing through addReservationByClick needs to create the order to reflect this new structure and define the value for "numOfSeats"

[jacob-bw]

update function still works and doesn't yield error. only add returns this error message.

and with newest master, the error message has changed to

reservations.js?e62e:49 TypeError: Cannot read property 'sectionId' of null at eval (reservations.js?e62e:35)