cargo clippy

src/api/client_server/account.rs

src/api/client_server/keys.rs

src/api/client_server/membership.rs

src/api/client_server/room.rs

src/api/client_server/session.rs

src/api/client_server/sync.rs

src/api/client_server/to_device.rs

src/api/client_server/user_directory.rs

src/api/server_server.rs

src/config/mod.rs

src/database/abstraction/rocksdb.rs

src/database/abstraction/sqlite.rs

src/database/key_value/globals.rs

src/database/key_value/pusher.rs

src/database/key_value/rooms/alias.rs

src/database/key_value/rooms/edus/presence.rs

src/database/key_value/rooms/edus/typing.rs

src/database/key_value/rooms/search.rs

src/database/key_value/rooms/timeline.rs

src/database/key_value/rooms/user.rs