lnd: pass through neutrino MaxPeers config

This enables users to set the config. We check that the currently set
value of MaxPeers is non-zero.

docs/release-notes/release-notes-0.19.0.md

@@ -88,6 +88,9 @@
 * [The aux bandwidth calculation was fixed for non-asset
   channels](https://github.com/lightningnetwork/lnd/pull/9502).
 
+* [Pass through](https://github.com/lightningnetwork/lnd/pull/9601) the unused
+  `MaxPeers` configuration variable for neutrino mode.
+
 # New Features
 
 * [Support](https://github.com/lightningnetwork/lnd/pull/8390) for 
@@ -419,6 +422,7 @@ The underlying functionality between those two options remain the same.
 * Abdullahi Yunus
 * Andras Banki-Horvath
 * Animesh Bilthare
+* bitromortac
 * Boris Nagaev
 * Carla Kirk-Cohen
 * CharlieZKSmith