Fix: Don't let CT_INVALID map to valid cargo type. (#12364)

(cherry picked from commit ff35288ddfa3b746412569aed7dfc2eedb1b2094)

# Conflicts:
#	src/cargotype.cpp

src/cargotype.cpp

@@ -102,7 +102,7 @@ void BuildCargoLabelMap()
 	_cargo_label_map.clear();
 	for (const CargoSpec &cs : CargoSpec::array) {
 		/* During initialization, CargoSpec can be marked valid before the label has been set. */
-		if (!cs.IsValid() || cs.label == CargoLabel{0}) continue;
+		if (!cs.IsValid() || cs.label == CargoLabel{0} || cs.label == CT_INVALID) continue;
 		/* Label already exists, don't add again. */
 		if (_cargo_label_map.count(cs.label) != 0) continue;