Fixes flaky test that keeps failing (#2537)

Also addresses the superfluous images that were being created by the DialogTests

Author: Keboo

MaterialDesignThemes.UITests/WPF/DialogHosts/DialogHostTests.cs

@@ -164,6 +164,8 @@ await Wait.For(async () =>
                 Assert.Equal(Colors.Red, await card1.GetBackgroundColor());
                 Assert.Equal(Colors.Red, await card2.GetBackgroundColor());
             });
+
+            recorder.Success();
         }
 
         [Theory]
@@ -242,6 +244,8 @@ await Wait.For(async () =>
                     await textBlock2.GetEffectiveBackground(),
                     MinimumContrastSmallText);
             });
+
+            recorder.Success();
         }
     }
 }

MaterialDesignThemes.UITests/WPF/DrawerHosts/DrawerHostTests.cs

@@ -52,6 +52,12 @@ await Wait.For(async () =>
             Assert.Equal(1, invocations.Count);
         });
 
+        await Wait.For(async () =>
+        {
+            Assert.True(await contentCover.GetIsHitTestVisible());
+            Assert.True(await contentCover.GetOpacity() > 0.0);
+        });
+
         await drawerHost.LeftClick();
 
         await Wait.For(async () => await contentCover.GetOpacity() <= 0.0);