Updated default provider variable to use latest
Updated default provider variable to use latest

The docs state that `vmware_desktop` is the common provider name when using the latest VMWare plugin. Updating this entry to match.
sni/vagrant,mitchellh/vagrant,mitchellh/vagrant,sni/vagrant,chrisroberts/vagrant,mitchellh/vagrant,marxarelli/vagrant,marxarelli/vagrant,sni/vagrant,sni/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,mitchellh/vagrant,marxarelli/vagrant,marxarelli/vagrant,chrisroberts/vagrant