[video_player] Re-enables asset videos live stream duration != 0 test for Android (flutter#8610)

Re-enables `asset videos live stream duration != 0` test that was previously disabled do to emulators having revoked access to the network.

Looks like this passed in https://firebase.corp.google.com/project/flutter-infra-staging/testlab/histories/bh.7dcabc1142c31699/matrices/7642642580824193465/executions/bs.d4c88757f607fa85/testcases/10/test-cases from https://ci.chromium.org/ui/p/flutter/builders/try/Linux_android%20android_device_tests_shard_1%20master/14302/overview but let me know if I'm wrong!

Fixes flutter/flutter#160797; see that issue for more details.

Author: camsim99

packages/video_player/video_player/example/integration_test/video_player_test.dart

@@ -56,15 +56,6 @@ void main() {
     testWidgets(
       'live stream duration != 0',
       (WidgetTester tester) async {
-        // This test requires network access, and won't pass until a LUCI recipe
-        // change is made.
-        // TODO(camsim99): Remove once https://github.com/flutter/flutter/issues/160797 is fixed.
-        if (!kIsWeb && Platform.isAndroid) {
-          markTestSkipped(
-              'Skipping due to https://github.com/flutter/flutter/issues/160797');
-          return;
-        }
-
         final VideoPlayerController networkController =
             VideoPlayerController.networkUrl(
           Uri.parse(