[camera_web] Mute the camera preview (#4280)

* feat: mute the camera preview

* test: update camera video element test with muted set to true

Author: bselwe

packages/camera/camera_web/example/integration_test/camera_test.dart

@@ -98,7 +98,7 @@ void main() {
 
         expect(camera.videoElement, isNotNull);
         expect(camera.videoElement.autoplay, isFalse);
-        expect(camera.videoElement.muted, !audioConstraints.enabled);
+        expect(camera.videoElement.muted, isTrue);
         expect(camera.videoElement.srcObject, mediaStream);
         expect(camera.videoElement.attributes.keys, contains('playsinline'));
 

packages/camera/camera_web/lib/src/camera.dart

@@ -119,7 +119,7 @@ class Camera {
 
     videoElement
       ..autoplay = false
-      ..muted = !options.audio.enabled
+      ..muted = true
       ..srcObject = stream
       ..setAttribute('playsinline', '');