Updated test to generate new snapshots (and verify the changes)

Author: jsuarezruiz

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue4879.cs

@@ -19,6 +19,7 @@ public void Issue4879Test()
 		{
 			App.WaitForElement("TestReady");
 			App.Screenshot("I am at Issue 4879. All buttons or images should be the same size.");
+			VerifyScreenshot();
 		}
 	}
 }