Remove MIT notice from bot event handlers

src/bot/event_handlers.rs

@@ -1,8 +1,3 @@
-/**
- * In addition to the terms of the AGPL, portions of this file
- * are governed by the terms of the MIT license, from the Rust Matrix
- * SDK example code.
- */
 use super::DiceBot;
 use crate::db::sqlite::Database;
 use crate::db::Rooms;