Update tntcarrier.php

This change fixes a bug with some cities like "SAINTES". Indeed, if we replace "SAINT" by "ST" in the city name, the webservice can not find any match with "STES"...
Merge branch 'patch-1' of github.com:ironwo0d/PrestaShop-modules into ironwo0d-patch-1
TNT Carrier - Version updated
Merge branch 'ironwo0d-patch-1'