Fix AsyncEnumerableTest to actually test GetAllProjectsAsTask endpoint

[campersau]

PR Title
Call the correct endpoint for AsyncEnumerableWrappedInTask which before was the same as AsyncEnumerableReturnedWorks.

PR Description
AsyncEnumerableWrappedInTask didn't call GetAllProjectsAsTask which jugding from the method names it seems like it should.

aspnetcore/src/Mvc/test/WebSites/FormatterWebSite/Controllers/AsyncEnumerableController.cs

Lines 19 to 24 in 6350af9

	[HttpGet]
	public async Task<IAsyncEnumerable<Project>> GetAllProjectsAsTask()
	{
	await Task.Yield();
	return GetAllProjectsCore();
	}

[pranavkm]

Thanks!