message: fuzz: reduce possible networks check
  If an address classifies as `IsRFC4193()`, then it cannot be
  `NET_ONION` (Tor v3), thus remove that condition from the assert.
diff: @@ -54,7 +54,7 @@ FUZZ_TARGET(netaddress)
  (void)net_addr.IsRFC3927();
  (void)net_addr.IsRFC3964();
  if (net_addr.IsRFC4193()) {
  - assert(net_addr.GetNetwork() == Network::NET_ONION || net_addr.GetNetwork() == Network::NET_INTERNAL || net_addr.GetNetwork() == Network::NET_UNROUTABLE);
  + assert(net_addr.GetNetwork() == Network::NET_INTERNAL || net_addr.GetNetwork() == Network::NET_UNROUTABLE);
  }
  (void)net_addr.IsRFC4380();
  (void)net_addr.IsRFC4843();
  