Do not rename global.json in standalone mode

Author: mbg

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependencyManager.cs

@@ -103,13 +103,9 @@ public DependencyManager(string srcDir, IDependencyOptions options, ILogger logg
                     progressMonitor.MissingNuGet();
                 }
 
-                // TODO: remove the below when the required SDK is installed
-                using (new FileRenamer(sourceDir.GetFiles("global.json", SearchOption.AllDirectories)))
-                {
-                    Restore(solutions);
-                    Restore(allProjects);
-                    DownloadMissingPackages(allFiles);
-                }
+                Restore(solutions);
+                Restore(allProjects);
+                DownloadMissingPackages(allFiles);
             }
 
             assemblyCache = new AssemblyCache(dllDirNames, progressMonitor);