title: delete form-control in form-row symfony/twig
body: <p>When i create this builder</p>
  
  <pre><code>    $builder
          -&gt;add('categorie', EntityType::class, [
          // This field shows all the categories
          'class'    =&gt; Categorie::class,
          'mapped' =&gt; false,
          'multiple' =&gt; true,
          'attr' =&gt; ['class' =&gt; 'mdb-select']
          ])
  </code></pre>
  
  <p>and when i do <strong>form_row(form.name)</strong></p>
  
  <p>i see class has value <strong>'form-control'</strong> automaticaly, but me i'm use MDBootstrap and i want to set only <strong>mdb-select</strong></p>