fix the staff username field to email

inventory/views.py

@@ -2658,7 +2658,7 @@ class UserCreateView(
         password = "Tenhal@123"
 
         user = User.objects.create_user(
-            username=form.cleaned_data["name"], email=email, password=password
+            username=email, email=email, password=password
         )
         user.is_staff = True
         user.save()