fix(barcode-scanner): fix the cameraView is not removed after scanning in iOS

.changes/fix-ios-cameraview-not-removed.md

@@ -0,0 +1,6 @@
+---
+"barcode-scanner": patch
+"barcode-scanner-js": patch
+---
+
+Fix the `cameraView` is not removed after scanning in iOS.

plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift

@@ -170,6 +170,7 @@ class BarcodeScannerPlugin: Plugin, AVCaptureMetadataOutputObjectsDelegate {
     if self.captureSession != nil {
       self.captureSession!.stopRunning()
       self.cameraView.removePreviewLayer()
+      self.cameraView.removeFromSuperview()
       self.captureVideoPreviewLayer = nil
       self.metaOutput = nil
       self.captureSession = nil