fix expected test result to include Bcc lines

this test actually tests behavior that I consider as broken.
The Bcc should be to the same address as used in the From line,
otherwise we are creating a potential information leak as email
that is related to one email account (say, work) is copied to
a different account

Signed-off-by: Dirk Hohndel <hohndel@infradead.org>
Reviewed-by: Carl Worth <cworth@cworth.org>
These tests don't actually pass yet, since the feature being tested
has not been merged. But gettting these tests in first will let us
more easily test that the feature actually works, (and will help us
ensure we don't forget the feature before the next release).