RCS1090 should ignore ConfigureAwait that is not a `false` boolean

[prezaei]

Verion: 4.1.8

---

How to repro:

    public static async Task FooAsync(this Func<Task> action)
    {
        await Task.CompletedTask.ConfigureAwait(ConfigureAwaitOptions.ForceYielding);
        await action();
    }