Add missing default value for moto.ec2.models.VPC.classic_link_dns_supported
Add missing default value for moto.ec2.models.VPC.classic_link_dns_supported

Fixes #2629
william-richard/moto,spulec/moto,william-richard/moto,spulec/moto,spulec/moto,spulec/moto,william-richard/moto,william-richard/moto,william-richard/moto,william-richard/moto,spulec/moto,spulec/moto