Fixed FedEx API Error

FedEx API docs state that StateOrProvinceCode is "Required if Sender Country Code is US or CA.", but OpenCart was sending the full state/province name when not US, causing FedEx to respond with the error "The length of the destination state or province exceeds the limit of 2 characters." This issue is fixed by sending no StateOrProvinceCode when not in US/CA.
Merge pull request #1 from BeyondWEB/patch-1

Fixed FedEx API Error