[Bug] Auto-time-skipping may not reset properly

[cretz]

Describe the bug

See this comment: temporalio/sdk-ruby#260 (comment). Specifically,

sdk-dotnet/src/Temporalio/Testing/WorkflowEnvironment.cs

Lines 323 to 338 in d48377d

	public override async Task<T> WithAutoTimeSkippingDisabledAsync<T>(Func<Task<T>> func)
	{
	var alreadyDisabled = autoTimeSkipping;
	autoTimeSkipping = false;
	try
	{
	return await func().ConfigureAwait(false);
	}
	finally
	{
	if (!alreadyDisabled)
	{
	autoTimeSkipping = true;
	}
	}
	}

might have its assignment/conditional backwards.