grc: mavlink: Fix mavlink camera compoenent never answering QGC

The problem is that the added delay was causing the subscription to be always late.

src/mavlink/mavlink_camera.rs

@@ -173,12 +173,18 @@ impl MavlinkCameraInner {
         use crate::mavlink::mavlink_camera::Message::Received;
 
         loop {
-            tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
+            match receiver.recv().await {
+                Ok(Received((header, message))) => {
+                    trace!("Message received: {header:?}, {message:?}");
 
-            if let Ok(Received((header, message))) = receiver.recv().await {
-                trace!("Message received: {header:?}, {message:?}");
+                    Self::handle_message(camera.clone(), sender.clone(), header, message).await;
+                }
+                Ok(Message::ToBeSent(_)) => (),
+                Err(error) => {
+                    error!("Failed receiving from broadcast channel: {error:#?}. Resubscribing to the channel...");
 
-                Self::handle_message(camera.clone(), sender.clone(), header, message).await;
+                    receiver = receiver.resubscribe();
+                }
             }
         }
     }