[FIX] calendar, web_calendar: change date

- Change the date of an event through the form view
  => a mail is sent to the attendees.
- Change the date of an event thanks to the drag and drop of an event
  => the mail is not sent.

It is necessary to introduce a context key in the write call so we can
make the distinction between the write triggered from the drag and drop
and the write triggered by a recomputation of fields. Indeed, when the
form view is used to change the date, `write` is called several times.
We should avoid sending the same email each time.

opw-766295

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