test: Fix stretch_none on ios/android

(cherry picked from commit a960f67)

src/SamplesApp/SamplesApp.UITests/Windows_UI_Xaml_Controls/ImageTests/UnoSamples_Tests.Image.cs

@@ -64,9 +64,7 @@ public void ImageStretch_None()
 
 			void HasValidSize(string name)
 			{
-				var element = _app.Marked(name);
-				_app.WaitForElement(element);
-				var rect = _app.Query(element).First().Rect;
+				var rect = _app.Query(q => q.All().Marked(name)).First().Rect;
 				Assert.That(rect.Width != 0);
 				Assert.That(rect.Height != 0);
 			}