pki: wireguard: T3642: add alias "generate wireguard key-pair" command
pki: wireguard: T3642: add alias "generate wireguard key-pair" command

Triggers the same code as "generate pki wireguard key-pair" which makes it easier
for users switching from 1.3 -> 1.4.

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x