Align previewLayer orientation with device

Do not hardcode the initial previewlayer orientation to portrait but follow the device orientation

src/ios/CDVBarcodeScanner.mm

@@ -924,7 +924,7 @@ - (void)viewDidAppear:(BOOL)animated {
     previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
 
     if ([previewLayer.connection isVideoOrientationSupported]) {
-        [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortrait];
+        [previewLayer.connection setVideoOrientation:[[UIApplication sharedApplication] statusBarOrientation]];
     }
 
     [self.view.layer insertSublayer:previewLayer below:[[self.view.layer sublayers] objectAtIndex:0]];