title: HelperList action 'delete' does not receive the ID
body: <p>I've created a list which is fully populated with records from database. I'd like to add a button 'delete' in order to delete records on demand. The button appears, but whenever it makes a request, it does not have an ID of the record I want to delete. The URL looks like this:</p>
  
  <pre><code>controller=AdminModules&amp;configure=estimateddelivery&amp;=&amp;deleteestimateddelivery&amp;token=6d1625ddf520e0bf8d2c43bea84f21d3
  </code></pre>
  
  <p>There is a <code>&amp;=&amp;</code> which if I understand correctly should be populated with something like <code>&amp;id=10&amp;</code>. I am not sure what the problem is or where to look at. I've check code examples of similar functionalities and it looks like I am doing everything the same way.</p>
  
  <pre><code>public function renderList()
      {  
          $this-&gt;$fields_list = [
              'id_estimateddelivery' =&gt; [
                  'title' =&gt; $this-&gt;l('ID'),
                  'type' =&gt;'text',
              ],
              'from' =&gt; [
                  'title' =&gt; $this-&gt;l('Delivery period from')
              ],
              'to' =&gt; [
                  'title' =&gt; $this-&gt;l('Delivery period to')
              ],
              'countries' =&gt; [
                  'title' =&gt; $this-&gt;l('Countries applicable'),
                  'type' =&gt; 'text'
              ]
          ];
  
          $helper = new HelperList();
          $helper-&gt;module = $this;
          $helper-&gt;shopLinkType = '';
          $helper-&gt;simple_header = true;
          $helper-&gt;idientifier = 'id_estimateddelivery';
          $helper-&gt;actions = [
              'delete'
          ];
          $helper-&gt;show_toolbar = false;
          $helper-&gt;title = $this-&gt;l('List of created estimated deliveries');
          $helper-&gt;table = $this-&gt;name;
          $helper-&gt;token = Tools::getAdminTokenLite('AdminModules');
          $helper-&gt;currentIndex = AdminController::$currentIndex . '&amp;configure=' . $this-&gt;name;
  
          return $helper-&gt;generateList($this-&gt;getEstimatedDeliveries(), $this-&gt;$fields_list);
      }
  </code></pre>
  
  <pre><code>public function deleteEstimatedDelivery()
  {
      return Db::getInstance()-&gt;execute('DELETE FROM '. _DB_PREFIX_ .'estimateddelivery WHERE `id_estimateddelivery` = '. (int)Tools::getValue('id_estimateddelivery'));
  }
  </code></pre>
  
  <pre><code>
  </code></pre>
  
  <pre><code>else if(Tools::isSubmit('delete' . $this-&gt;name))
  {
      if(!$this-&gt;deleteEstimatedDelivery())
          $output . $this-&gt;displayError($this-&gt;l('An error occured during link deletion'));
      else
          $output . $this-&gt;displayConfirmation($this-&gt;l('The estimated delivery has been deleted'));
  }
  </code></pre>
  
  <pre><code>
  </code></pre>