unbound: Fix "register DHCP leases in DNS" config option

The option to register DHCP leases within unbound DNS was configurable via
DNS Resolver GUI, but the setting was ignored. DHCP leases were always applied.

src/etc/inc/unbound.inc

@@ -549,6 +549,7 @@ function unbound_add_host_entries() {
     }
 
     // Handle DHCPLeases added host entries
+    if (isset($config['unbound']['regdhcp'])) {
         $dhcplcfg = read_hosts();
         $host_entries = "";
         if (is_array($dhcplcfg)) {
@@ -562,6 +563,7 @@ function unbound_add_host_entries() {
             }
             $unbound_entries .= $host_entries;
         }
+    }
 
     // Write out entries
     bootstrap_unbound_root();