Autobahn test suite fix(#4302)

Author: mikaelm12

src/Middleware/WebSockets/test/AutobahnTestApp/Properties/launchSettings.json

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace Microsoft.AspNetCore.WebSockets.ConformanceTest
@@ -7,22 +7,7 @@ public class Helpers
     {
         public static string GetApplicationPath(string projectName)
         {
-            var applicationBasePath = AppContext.BaseDirectory;
-
-            var directoryInfo = new DirectoryInfo(applicationBasePath);
-            do
-            {
-                var solutionFileInfo = new FileInfo(Path.Combine(directoryInfo.FullName, "WebSockets.sln"));
-                if (solutionFileInfo.Exists)
-                {
-                    return Path.GetFullPath(Path.Combine(directoryInfo.FullName, "test", projectName));
-                }
-
-                directoryInfo = directoryInfo.Parent;
-            }
-            while (directoryInfo.Parent != null);
-
-            throw new Exception($"Solution root could not be found using {applicationBasePath}");
+            return Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, projectName));
         }
     }
 }