Fix cast of non appcompat renderer to DrawerLayout

[PureWeen]

Description of Change

The NonAppCompat version of MDP was trying to cast its renderer to FlyoutPageRenderer but that's not a valid renderer for the Non AppCompat version of MDP. This changes the cast to be to a DrawerLayout which is the actual type trying to be achieved

Platforms Affected

• Android

Testing Procedure

Here's the code from the gallery I was using to test this code

SetMainPage(new MasterDetailPage()
			{
				IconImageSource = "coffee.png",
				Master = new NavigationPage(new ContentPage()
				{
					Title = "test",
					Content = new Button()
					{
						Text = "hello",
						Command = new Command(() =>
						{
							(Application.Current.MainPage as MasterDetailPage)
							.Detail = new NavigationPage(new ContentPage() { Title = "test" });
						}
						)
					}
				})
				{
					IconImageSource = "coffee.png",
					Title = "Master Page"
				},
				Detail = new ContentPage() { Title = "test" },
			});

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)