Return a more detailed lnd rpc response error when the upstream improves

[kristapsk]

ndg/src/lightning/lndhttp.zig

Lines 167 to 172 in 729af48

	if (req.response.status.class() != .success) {
	// a structured error reporting in lnd is unclear:
	// https://github.com/lightningnetwork/lnd/issues/5586
	// TODO: return a more detailed error when the upstream improves.
	return Error.LndHttpBadStatusCode;
	}

Waiting on lightningnetwork/lnd#5586.