[api/stream] use event connect instead of connection
[api/stream] use event connect instead of connection

Event connection is synonym of Event connect.
see https://socket.io/docs/server-api/#event-connection.

Tosuke/Misskey-Web,misskey-delta/Misskey-Web,Tosuke/Misskey-Web,Tosuke/Misskey-Web,armchair-philosophy/Misskey-Web,armchair-philosophy/Misskey-Web,Tosuke/Misskey-Web,misskey-delta/Misskey-Web,armchair-philosophy/Misskey-Web,misskey-delta/Misskey-Web