fix(lotw): MY_CNTY must not sink a non-US station's upload

TQSL validates MY_CNTY against the ADIF secondary-subdivision list,
which is the US county enumeration — 'XX,County' with a two-letter
state. A Canadian profile produced 'ONTARIO,Kawartha' (the export joined
MY_STATE onto the county wholesale) and TQSL refused the whole record.

Two layers: adifCounty only prefixes a two-letter state, so exports stop
manufacturing the invalid shape; and UploadLoTW scrubs any MY_CNTY that
is not the US shape before signing — MY_STATE and MY_GRIDSQUARE already
locate the station for LoTW, and the US form survives for the county
hunters. Table-tested.

changelog.json

@@ -5,12 +5,14 @@
     "en": [
       "Switching the settings database no longer shows “OpsLog is already running”: the automatic relaunch now waits for the closing instance to release its lock instead of racing it.",
       "HamQTH upload: 8th external service — real-time QSO upload to the HamQTH online logbook with your callbook credentials (auto-upload on log, “Send to…” right-click, QSL Manager backlog upload, connection test).",
-      "Fixed: the right-click “Send to HAMLOG.online” was uploading the selection to QRZ.com with the QRZ key — it now goes to HAMLOG.online."
+      "Fixed: the right-click “Send to HAMLOG.online” was uploading the selection to QRZ.com with the QRZ key — it now goes to HAMLOG.online.",
+      "LoTW: TQSL no longer refuses non-US stations over MY_CNTY — the field is stripped before signing unless it is the US “XX,County” shape LoTW actually validates (a Canadian “ONTARIO,Kawartha” was rejecting the whole record). Exports also stop gluing a full state name onto the county."
     ],
     "fr": [
       "Changer de base de réglages n’affiche plus « OpsLog is already running » : la relance automatique attend désormais que l’instance qui se ferme libère son verrou au lieu de la prendre de vitesse.",
       "Upload HamQTH : 8e service externe — envoi des QSO en temps réel vers le logbook HamQTH avec vos identifiants du lookup (upload auto au log, « Envoyer vers… » au clic droit, rattrapage via le QSL Manager, test de connexion).",
-      "Corrigé : le clic droit « Envoyer vers HAMLOG.online » envoyait la sélection à QRZ.com avec la clé QRZ — elle part maintenant vers HAMLOG.online."
+      "Corrigé : le clic droit « Envoyer vers HAMLOG.online » envoyait la sélection à QRZ.com avec la clé QRZ — elle part maintenant vers HAMLOG.online.",
+      "LoTW : TQSL ne refuse plus les stations hors US à cause de MY_CNTY — le champ est retiré avant signature sauf s’il a la forme US « XX,County » que LoTW valide réellement (un « ONTARIO,Kawartha » canadien rejetait tout l’enregistrement). L’export cesse aussi de coller un nom d’état complet devant le comté."
     ]
   },
   {