Re-add the certificate check for lnd on macOS

[da-kami]

Problem

Due to #2464 (comment) we changed comit-rs' compilation for macOS to not include the certificate check:

comit-rs/cnd/src/swap_protocols/halight/connector.rs

Lines 453 to 458 in 9735d3f

	#[cfg(target_os = "macos")]
	let client = reqwest::Client::builder()
	.danger_accept_invalid_certs(true)
	.add_root_certificate(cert)
	.default_headers(default_headers)
	.build()?;

Goal

Remove the conditional compilation that excludes certificate validation on macOS.

There is already a fix on the certificate generation for lnd on the way: lightningnetwork/lnd#4201

I could confirm that this change fixes the problem on my machine.

Once lightningnetwork/lnd#4201 is closed and the change goes into a new release we can upgrade to the new lnd version and remove the conditional compilation on macOS.

[github-actions]

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