message: chore: fix VMF controller and route snippets
diff: <demo.snippet @name='validated-model-form.demo-edit.hbs' />
  <demo.snippet
  - @name='validated-model-form.on-will-destroy.ts'
  + @name='validated-model-form.controller.ts'
  @label='controller.ts'
  />
  <demo.snippet
  - @name='validated-model-form.is-page-dirty.ts'
  + @name='validated-model-form.route.ts'
  @label='route.ts'
  />
  {{/if}}
  