luci-mod-network: update odhcpd configuration

Update two cfg parameters that have changed names/behaviour in recent
versions of odhcpd.

Signed-off-by: David Härdeman <david@hardeman.nu>

Author: Alphix

modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js

@@ -616,11 +616,11 @@ return view.extend({
 			_('Lease trigger'),
 			_('Path to a script to run each time the lease file changes.'));
 
-		o = s.taboption('general', form.Value, 'hostsfile',
+		o = s.taboption('general', form.Value, 'hostsdir',
 			_('Hosts file'),
-			_('Path to store a hostsfile (IP address to hostname mapping) in. Used by e.g. <code>dnsmasq</code>.'));
+			_('Directory to store hosts files (IP address to hostname mapping) in. Used by e.g. <code>dnsmasq</code>.'));
 
-		o = s.taboption('general', form.Value, 'piofolder',
+		o = s.taboption('general', form.Value, 'piodir',
 			_('PIO directory'),
 			_('Directory to store IPv6 prefix information files in (to detect and announce stale prefixes).'));