MailFolderCache: Remove the "session" property.

I considered replacing the "session" property with a "registry"
property, but that just complicates application startup even more.
Fact is, if we have a CamelStore then we can get the CamelSession
and even the ESourceRegistry from it.  Kinda dirty, but works.

It goes a little something like this...

  camel_service = CAMEL_SERVICE (camel_store);
  camel_session = camel_service_get_session (camel_service);
   mail_session = E_MAIL_SESSION (camel_session);
       registry = e_mail_session_get_registry (mail_session);

Removed functions:

  mail_folder_cache_get_session()

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