remove RoleNames from call to CreateUserAsync

when registering a new user

src/OrchardCore.Modules/OrchardCore.Users/Controllers/ControllerExtensions.cs

@@ -87,7 +87,7 @@ internal static async Task<IUser> RegisterUser(this Controller controller, Regis
 
                 if (controller.ModelState.IsValid)
                 {
-                    var user = await userService.CreateUserAsync(new User { UserName = model.UserName, Email = model.Email, EmailConfirmed = !settings.UsersMustValidateEmail, RoleNames = new string[0] }, model.Password, (key, message) => controller.ModelState.AddModelError(key, message)) as User;
+                    var user = await userService.CreateUserAsync(new User { UserName = model.UserName, Email = model.Email, EmailConfirmed = !settings.UsersMustValidateEmail }, model.Password, (key, message) => controller.ModelState.AddModelError(key, message)) as User;
 
                     if (user != null && controller.ModelState.IsValid)
                     {