corrects minor branding issue with cast/airplay

lib/casting_business_object.dart

@@ -72,7 +72,9 @@ class CastingBusinessObject extends ChangeNotifier {
       return;
     }
 
-    _setStatus(CastingStatus.connecting);
+    if (defaultTargetPlatform == TargetPlatform.android) {
+      _setStatus(CastingStatus.connecting);
+    }
 
     try {
       await _methodChannel.invokeMethod<void>('showDevicePicker');