Automaticaly enable the bitcoin service when a LN node is enabled

```
warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring
error:
… while calling the 'head' builtin
at /nix/store/x9wnkly3k1gkq580m90jjn32q9f05q2v-source/lib/attrsets.nix:1534:13:
1533| if length values == 1 || pred here (elemAt values 1) (head values) then
1534| head values
| ^
1535| else
… while evaluating the attribute 'value'
at /nix/store/x9wnkly3k1gkq580m90jjn32q9f05q2v-source/lib/modules.nix:1084:7:
1083| // {
1084| value = addErrorContext "while evaluating the option `${showOption loc}':" value;
| ^
1085| inherit (res.defsFinal') highestPrio;
… while evaluating the option `system.build.toplevel':
… while evaluating definitions from `/nix/store/x9wnkly3k1gkq580m90jjn32q9f05q2v-source/nixos/modules/system/activation/top-level.nix':
… while evaluating the option `assertions':
… while evaluating definitions from `/nix/store/3ipnrh8kacbhawf90zsi5y0i8kpv7b1b-source/nixos/common.nix':
… while evaluating the option `home-manager.users.admin.assertions':
… while evaluating definitions from `/nix/store/3ipnrh8kacbhawf90zsi5y0i8kpv7b1b-source/modules/systemd.nix':
… while evaluating the option `home-manager.users.admin.home.username':
… while evaluating definitions from `/nix/store/3ipnrh8kacbhawf90zsi5y0i8kpv7b1b-source/nixos/common.nix':
… while evaluating the option `users.users':
… while evaluating definitions from `/nix/store/f9wi26djyrxzcg79l4r593vp45yfljhi-source/modules/bitcoind.nix':
… while evaluating the option `services.bitcoind.enable':
(stack trace truncated; use '--show-trace' to show the full, detailed trace)
error: The option `services.bitcoind.enable' has conflicting definition values:
- In `/nix/store/hx4lg3k7qz0nc4bar9qyxv0a05c1jaj7-source/src/btc.nix': false
- In `/nix/store/f9wi26djyrxzcg79l4r593vp45yfljhi-source/modules/lnd.nix': true
Use `lib.mkForce value` or `lib.mkDefault value` to change the priority on any of these definitions.
--- Process finished with status: exit status: 1 ---
Error applying changes: Unknown error
├╴at cli/src/commands/apply.rs:12:10
│
╰─▶ Unable to apply changes
├╴at /build/packages/nixblitzlib/src/utils.rs:254:33
╰╴Command exited with non-zero status.
```