Removed old code "I"

Old code "I" was not removed in initial commit for some reason.

Author: gwharton

app/code/Magento/Dhl/Model/Carrier.php

@@ -606,7 +606,6 @@ public function getDhlProducts($doc)
             'L' => __('Express 10:30'),
             'G' => __('Domestic economy select'),
             'W' => __('Economy select'),
-            'I' => __('Break bulk economy'),
             'I' => __('Domestic express 9:00'),
             'N' => __('Domestic express'),
             'O' => __('Domestic express 10:30'),