By disabling `trustedcoin.tor.proxy` and enabling `clightning.tor.proxy`,
`trustedcoin` can be used without Tor proxying, while clighting still
uses Tor for lightning layer connections.
Previously, disabling Tor for `trustedcoin` required to also disable
Tor for clightning.
Also fix the workaround in the docs for the trustedcoin Tor connection issues:
The previous config snippet only affected systemd hardening settings,
but didn't disable Tor for trustedcoin.
This decouples modules `clightning` and `trustedcoin`.
`clightning` no longer depends on `trustedcoin`, which restores
the acyclic dependency graph described in `modules.nix`
