await completion adds async to unrelated local function instead of the containing method declaration

[Youssef1313]

I had a code like this:

		[TestMethod]
		public void Test()
		{
			var logs = new List<string>();
			var image = new Image();
			var bitmapImage = new BitmapImage(new Uri("ms-appx:///Assets/test_image_100_150.png"));
			bitmapImage.ImageFailed += BitmapImage_ImageFailed;
			bitmapImage.DownloadProgress += BitmapImage_DownloadProgress;
			bitmapImage.ImageOpened += BitmapImage_ImageOpened;
			image.ImageFailed += Image_ImageFailed;
			image.ImageOpened += Image_ImageOpened;
			var imageOpened = false;

			void BitmapImage_ImageFailed(object sender, ExceptionRoutedEventArgs e) => logs.Add("BitmapImage_ImageFailed");
			void BitmapImage_DownloadProgress(object sender, DownloadProgressEventArgs e) => logs.Add("BitmapImage_DownloadProgress");
			void BitmapImage_ImageOpened(object sender, RoutedEventArgs e) => logs.Add("BitmapImage_ImageOpened");
			void Image_ImageFailed(object sender, ExceptionRoutedEventArgs e) => logs.Add("Image_ImageFailed");
			void Image_ImageOpened(object sender, RoutedEventArgs e)
			{
				logs.Add("Image_ImageOpened");
				imageOpened = true;
			}

			$$ TestServices.WindowHelper.WaitFor(() => imageOpened);
		}

Invoke await completion in place of $$.

Image_ImageOpened will be async instead of Test