fixed clippy errors

src/realtime.rs

@@ -43,6 +43,12 @@ impl RealtimeMessages {
     }
 }
 
+impl Default for RealtimeMessages {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RealTimeVoices {
     pub fn new() -> Self {
         Self {
@@ -63,3 +69,9 @@ impl RealTimeVoices {
         self.rooms.retain(|_, sender| sender.receiver_count() > 0);
     }
 }
+
+impl Default for RealTimeVoices {
+    fn default() -> Self {
+        Self::new()
+    }
+}