Incorrect counter of unread messages in Direct chat

[eugepae]

• Case 1

1. User1 create chat and send 2 messages
2. User2 waiting for messages viewing chat list
3. User1 delete 1 message
4. User2 receive incorrect number of unread messages

• Case 2

1. User2 create chat and send 2 messages
2. User1 waiting for messages viewing chat list
3. User2 delete 1 message
4. User1 not receive number of unread messages