Incorrectly imported csv with rates

[lisovyievhenii]

See https://github.com/DPDBeNeLux/magento2-shipping/blob/master/Model/ResourceModel/Tablerate.php#L315

Change it to:

$this->importConditionName = $this->getConditionName($object, $this->shippingMethod);

Explanation:
when importer runs, the $object->getGroupId() returns the name of the first shipping method that you have (dpd_classic). It walks through the files for import, but $this->importConditionName stays same for all other shipping methods.