unbound: add file parameter to service instance

that way, procd does not needlessly restart unbound on triggers when
everything remains the same - changes in non-default included
configuration files will not be registered, however

Signed-off-by: Jan Klos <jan@klos.xyz>

net/unbound/files/unbound.init

@@ -40,6 +40,7 @@ start_service() {
   procd_open_instance "unbound"
   procd_set_param command $PROG -d -c $UB_TOTAL_CONF
   procd_set_param respawn
+  procd_set_param file "$UB_TOTAL_CONF" "$UB_SRV_CONF" "$UB_EXT_CONF"
   procd_close_instance
 }