Tests are failing, try to fix with OriginalString

- This should be an OriginalString and not ToString. Cannot understand why
  this works on local machine but not on build server though.

Tests/Tests.Shared/WebSSO/Saml2RedirectBindingTests.cs

@@ -370,7 +370,7 @@ public void Saml2RedirectBinding_Unbind_ThrowsOnWeakSignatureAlgorithm()
         [TestMethod]
         public void Saml2RedirectBinding_Unbind_ThrowsOnSignatureWithTamperedData_SAMLRequest()
         {
-            var url = CreateAndBindMessageWithSignature(messageName: "SAMLRequest").Location.ToString();
+            var url = CreateAndBindMessageWithSignature(messageName: "SAMLRequest").Location.OriginalString;
 
             url = url.Replace("RelayState=", "RelayState=X");
 
@@ -385,7 +385,7 @@ public void Saml2RedirectBinding_Unbind_ThrowsOnSignatureWithTamperedData_SAMLRe
         [TestMethod]
         public void Saml2RedirectBinding_Unbind_ThrowsOnSignatureWithTamperedData_SAMLResponse()
         {
-            var url = CreateAndBindMessageWithSignature(messageName: "SAMLResponse").Location.ToString();
+            var url = CreateAndBindMessageWithSignature(messageName: "SAMLResponse").Location.OriginalString;
 
             url = url.Replace("RelayState=", "RelayState=X");
 
@@ -403,7 +403,7 @@ public void Saml2Redirectbinding_Unbind_TrustLevelNoneWithMissingOptions()
             // The stub idp uses the binding, but doesn't provide an options
             // instance - enable it to do so by ignoring certificates.
 
-            var url = CreateAndBindMessageWithSignature(messageName: "SAMLResponse").Location.ToString();
+            var url = CreateAndBindMessageWithSignature(messageName: "SAMLResponse").Location.OriginalString;
 
             var request = new HttpRequestData("GET", new Uri(url));