Modernize various sender_user/sender_device lets.

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

src/api/client/room/aliases.rs

@@ -15,10 +15,7 @@ pub(crate) async fn get_room_aliases_route(
 	State(services): State<crate::State>,
 	body: Ruma<aliases::v3::Request>,
 ) -> Result<aliases::v3::Response> {
-	let sender_user = body
-		.sender_user
-		.as_ref()
-		.expect("user is authenticated");
+	let sender_user = body.sender_user();
 
 	if !services
 		.rooms