fix #3781: add Provides: wireguard-modules to control.in
without this line `apt install wireguard` pulls in Debian's kernel +
firmware which confilcts with pve-firmware - forcing users to install
via `apt install --no-install-recommends wireguard-tools` in order to
get the userspace utils.
Plain debian has the 'Provides' in the meta-package[0]
(linux-image-amd64), so following this add it to pve-kernel-$MAJ.$MIN
versioned dependency added since wireguard has a versioned dependency
on wireguard-modules.