SpambotUserspamForm should not be a config form; should use 'actions'

Problem/Motivation

SpambotUserspamForm should not extend ConfigFormBase because it isn't a configuration form, and it should place it's buttons inside 'actions' elements to ensure proper styling. Because it does extend ConfigFormBase, a form_alter function was needed to hide the Save Configuration button. When displayed, the form's buttons are not styled consistently with the rest of Drupal because the buttons are not nested within an actions element.