unbound: fix odhcpd trigger script

Read UNBOUND_TXT_DOMAIN from main unbound configuration.
This prevents records to be added into Unbound in the default 'lan' zone.

Signed-off-by: Audric Schiltknecht <storm+github@chemicalstorm.org>

net/unbound/files/odhcpd.sh

@@ -33,6 +33,7 @@ odhcpd_settings() {
   local cfg="$1"
   config_get UNBOUND_D_DHCP_LINK  "$cfg" dhcp_link none
   config_get_bool UNBOUND_B_SLAAC6_MAC "$cfg" dhcp4_slaac6 0
+  config_get UNBOUND_TXT_DOMAIN "$cfg" domain lan
 }
 
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