wireguard-tools: Remove hard dependency to wireguard-module
The default Linux kernel for dunfell is 5.4 and the wireguard module was added upstream in 5.6. Thus dunfell uses an external module to provide wireguard.
We use the Linux kernel 5.10 for some time now and enabled wireguard. The wireguard-module is not needed anymore so remove it and us the kernel-module-wireguard instead.