title: Symfony forms disabled option in select
body: <p>i have problem with disabled select option which exist in relation table. How i can to do it? </p>
  
  <pre><code>/**
   * @ORM\ManyToMany(targetEntity="Status", inversedBy="orderWork")
   * @ORM\JoinTable(name="order_status",
   *      joinColumns={@ORM\JoinColumn(name="order_id", referencedColumnName="id")},
   *      inverseJoinColumns={@ORM\JoinColumn(name="status_id", referencedColumnName="id")}
   *      )
   */
  
  private $status;
  </code></pre>
  
  <p>and in form -></p>
  
  <pre><code>-&gt;add('status', EntityType::class, ['label' =&gt; 'Užsakymo būsena',
          'attr' =&gt; ['class' =&gt; 'form-control' ,'style' =&gt; 'margin-bottom:15px; width:250px; height:30px;'],
          'class' =&gt; 'AppBundle:Status',
          'query_builder' =&gt; function ($em) {
              return $em-&gt;createQueryBuilder('s')
                  -&gt;orderBy('s.id', 'ASC');
              },
      'choice_label' =&gt; 'name'])
  </code></pre>