Remove ' from test

Avoids: `error MSB1009: Project file does not exist.`

Author: jonathanpeppers

src/Controls/tests/Xaml.UnitTests/MSBuild/MSBuildTests.cs

@@ -284,7 +284,7 @@ public void ConfigurationDefaultsToRelease([Values("Release", "ReleaseProd")] st
 			project.Add(AddFile("MainPage.xaml", "MauiXaml", Xaml.MainPage));
 			var projectFile = IOPath.Combine(tempDirectory, "test.csproj");
 			project.Save(projectFile);
-			Build(projectFile, additionalArgs: $"-c '{configuration}'");
+			Build(projectFile, additionalArgs: $"-c {configuration}");
 
 			var testDll = IOPath.Combine(intermediateDirectory, "test.dll");
 			AssertExists(testDll, nonEmpty: true);