[Assets] Compiler: use thread-safe version of NuGet (when writing loc…

…k file)

sources/assets/Xenko.Core.Assets.CompilerApp/NuGetAssemblyResolver.cs

@@ -69,6 +69,7 @@ internal static void __Initialize__()
                 {
                     LockFilePath = "project.lock.json",
                     RequestedRuntimes = { "win7-d3d11" },
+                    ProjectStyle = ProjectStyle.DotnetCliTool,
                 };
 
                 var command = new RestoreCommand(request);