Prepare the receiver for self-sent messages with empty To field #6407
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This is a preparation PR for #6401. Currently Delta Chat puts self address in the
To
field when there are no other recipients, e.g. in Saved Messages chat or in "member removed" message deleting the last member. I want to change this to send emptyhidden-recipients
group instead like some clients do when there are only Bcc recipients or like we already do for broadcast lists. Currently Delta Chat assigns such messages to trash unless they are broadcast list messages, this PR fixes this with a test.