Issue prompting for authentication on OSX with Chrome as default browser

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# Issue Description
When using `flutter_web_auth v0.4.1` on Darwin OSX (12.5.1) targets that have the default browser set to Chrome (Version 105.0.5195.102 (Official Build) (x86_64)), the authentication prompt opens and closes immediately afterwards, causing a `PlatformException`. If the default browser is set to Safari, the authentication flows work as expected.

# Steps to reproduce
1. Set Chrome as default browser in OSX
2. Start the authentication flow with the default browser (Chrome), using `flutter_web_auth v0.4.1`
3. See the chrome window open and immediately close
4. Stack trace:

```dart
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(EUNKNOWN, The operation couldn’t be completed. (com.apple.AuthenticationServices.WebAuthenticationSession error 3.), null, null)
#0 StandardMethodCodec.decodeEnvelope
package:flutter/…/services/message_codecs.dart:653
#1 MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:296

#2 FlutterWebAuth.authenticate
package:flutter_web_auth/flutter_web_auth.dart:35

```

Start by reproducing the authentication flow with Chrome set as the macOS default browser, then read flutter_web_auth.dart at FlutterWebAuth.authenticate and the reported AuthenticationServices.WebAuthenticationSession error. Done means the flow no longer closes immediately and completes without the reported PlatformException when Chrome is the default browser.

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