Changed testcase properties to use Label to match mstest filter format (#175)

Changed testcase properties to use Label to match mstest filter syntax

Author: vincentleungrsm

src/Machine.Specifications.Runner.VisualStudio/Execution/SpecificationFilterProvider.cs

@@ -18,8 +18,8 @@ public class SpecificationFilterProvider : ISpecificationFilterProvider
 
         private readonly Dictionary<string, TestProperty> testCaseProperties = new Dictionary<string, TestProperty>(StringComparer.OrdinalIgnoreCase)
         {
-            [TestCaseProperties.FullyQualifiedName.Id] = TestCaseProperties.FullyQualifiedName,
-            [TestCaseProperties.DisplayName.Id] = TestCaseProperties.DisplayName
+            [TestCaseProperties.FullyQualifiedName.Label] = TestCaseProperties.FullyQualifiedName,
+            [TestCaseProperties.DisplayName.Label] = TestCaseProperties.DisplayName
         };
 
         private readonly Dictionary<string, TestProperty> traitProperties = new Dictionary<string, TestProperty>(StringComparer.OrdinalIgnoreCase)