Fix recipients in users-bubble

[sazanof]

The second part of "Avatar" trylogy. Named "The Avatar: Way of lost recipients in user bubble"

Linked with https://github.com/nextcloud/mail/pull/6686

In the list of recipients in the letter How to reproduce: add 1 contact with the address [email protected] (in my case, this is a mailing group) and с[email protected] and set avatars for them Write to [email protected] from your email Open this email and see that the wrong avatar is in the recipient list. Click on "details" and see that in the list of "identical contacts" all@ and call@