use/enable let_underscore_must_use lint

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/admin/room/room_commands.rs

@@ -1,4 +1,4 @@
-use std::fmt::Write as _;
+use std::fmt::Write;
 
 use ruma::{events::room::message::RoomMessageEventContent, OwnedRoomId};
 
@@ -48,7 +48,7 @@ pub(crate) async fn list(_body: Vec<&str>, page: Option<usize>) -> Result<RoomMe
 					members,
 					escape_html(name)
 				)
-				.unwrap();
+				.expect("should be able to write to string buffer");
 				output
 			})
 	);