nit: s/socket-vmnet/socket_vmnet/g

[AkihiroSuda]

socket_vmnet seems referred as "socket-vmnet" in GUI and docs:

• https://github.com/search?q=repo%3Arancher-sandbox%2Francher-desktop%20socket-vmnet&type=code
• https://docs.rancherdesktop.io/ui/preferences/virtual-machine/network/

[jandubois]

This option will just be removed once vde_vmnet is gone. Users don't know what any of this means anyways; it is just confusing.