Fix the 'sample13 sln with solution files'

One of the previpis 2 PRs added a test that expected the test folder name to include path separators, and then the other fixed it so that the folder names are just the names with no separators, so the two didn't get on with each other

Author: Numpsy

test/Ionide.ProjInfo.Tests/Tests.fs

@@ -2322,7 +2322,7 @@ let sample13SolutionFilesTest toolsPath loaderType workspaceFactory =
             let solutionItem = solutionContents.Items[0]
 
             Expect.equal solutionItem.Guid (Guid("8ec462fd-d22e-90a8-e5ce-7e832ba40c5d")) "Should have the epxcted guid"
-            Expect.equal solutionItem.Name $"{Path.DirectorySeparatorChar}Solution Items{Path.DirectorySeparatorChar}" "Should have the expected folder name"
+            Expect.equal solutionItem.Name "Solution Items" "Should have the expected folder name"
 
             match solutionItem.Kind with
             | InspectSln.Folder(_, files) ->