Additional new nightly lint fixes.

Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/room/commands.rs

@@ -55,7 +55,7 @@ pub(super) async fn room_list(
 		.collect::<Vec<_>>()
 		.join("\n");
 
-	self.write_str(&format!("Rooms ({}):\n```\n{body}\n```", rooms.len(),))
+	self.write_str(&format!("Rooms ({}):\n```\n{body}\n```", rooms.len()))
 		.await
 }