[backend] Documents : correction problème quantités (rapport aux unités)

backend/views/document/download.php

                                         <?php if(Yii::$app->controller->getClass() != 'DeliveryNote'): ?>
                                                 <td class="align-center"><?= Price::format($productOrder->getPrice()) ?></td>
                                         <?php endif; ?>
-                                        <td class="align-center"><?= $productOrder->quantity ?></td>
+                                        <td class="align-center"><?= $productOrder->quantity * Product::$unitsArray[$productOrder->unit]['coefficient'] ?></td>
                                         <td class="align-center"><?= Product::strUnit($productOrder->unit, 'wording') ?></td>
                                         <?php if(Yii::$app->controller->getClass() != 'DeliveryNote'): ?>
                                                 <?php if(GlobalParam::getCurrentProducer()->taxRate->value != 0): ?>