input: Write a function to delete checkbox items from a list.
  assert delete_checkbox_items(['Apples', 'Orange', 'Bananas', 'Cherries', 'Checkbox'])==['Apples', 'Orange', 'Bananas', 'Cherries']
  assert delete_checkbox_items(['Checkbox', 'Checkbox', 'Apples', 'Checkbox', 'Bananas'])==['Apples', 'Bananas']
  assert delete_checkbox_items(['Checkbox', 'Checkbox'])==[]
output: def delete_checkbox_items(items):
      return [item for item in items if item != 'Checkbox']