Remove NeedsFirstAfterWrite state

* src/mail.h (CryptState): Remove NeedsFirstAfterWrite
* src/mailitem-events.cpp (Write, AfterWrite): Disable
crypto copy code for now. As we encrypt differently now.

The needs first after write state basically meant that we
needed to get Outlook to parse / update all information about
the mail. We now do this in update_oom_data by saving the
mail to a temporary file.