Unread count won't zeroize if you are removed from secret chat before read unread messages

[Paul Katurov]

How it was done:

- User "A" creates secret chat
- User "A" adds user "B" to secret chat
- User "A" sends messages
- App of "B" shows unread count (1)
- User "A" kiks-off "B" out of the chat
- App of "B" will show "1" as unread but no chat to check

This will repeated on any app of "B".

This is masked time to time: if "B" opens desktop (OSX) app this will mark all as read on mobile (IOS) but...
- Open desktop app (OSX)
- app on mobile (IOS) marked as "0" (all are read)
- open app on mobile
- app shows 1 unread

Funny enough.