Remove ProtectionStatus::ProtectionBroken #7041
Description
Btw, what about chats with broken protection existing before the key-contacts migration? Looked into the code quickly, but did't see anything repairing their state.
Probably we should remove the ProtectionBroken variant from ProtectionStatus, and when loading a chat, interpret an unknown value as Unprotected. [...]
Originally posted by @Hocuri in #7018 (comment)