use a SendTo enum instead of using Option to know who to send the broadcast message

src/api/mod.rs

@@ -63,6 +63,7 @@ pub enum Request {
     GetScene {
         id: usize,
     },
+    /// TODO: Perhaps remove it, as the client should auto get it on login and on scene list updates
     GetSceneList,
     GetTokens {
         scene: usize,