Fix colombian phone numbers without the leading +

Colombian mobile numbers can be called without the leading "+". Google's libphonenumber supports it but PhoneNumber.js doesn't.

The problem is that PhoneNumber.js first checks that the number is a possible national number and if it isn't then it checks if it can be an international number without the leading "+".

The check of possible national numbers more loose than the check of being an international number, so most international numbers without the leading "+" are considered national numbers.