Add LUA record type to dropdown

Add LUA type records as described in https://doc.powerdns.com/authoritative/lua-records/

Author: maltris

templates/zone.php

@@ -184,6 +184,7 @@
 								<option value="NS" data-content-pattern="\S*">NS</option>
 								<?php } ?>
 								<option value="LOC" data-content-pattern="[0-9]{1,2} ([0-9]{1,3} ([0-9]{1,2}(\.[0-9]{1,3})?)?)? [NS] [0-9]{1,2} ([0-9]{1,3} ([0-9]{1,2}(\.[0-9]{1,3})?)?)? [EW] -?[0-9]+(\.[0-9]{1,2})?m?( [0-9]+(\.[0-9]{1,2})?m?( [0-9]+(\.[0-9]{1,2})?m?( [0-9]+(\.[0-9]{1,2})?m?)))">LOC</option>
+								<option value="LUA" data-content-pattern=".*">LUA</option>
 								<option value="MX" data-content-pattern="[0-9]+\s+\S+">MX</option>
 								<option value="PTR" data-content-pattern="\S+">PTR</option>
 								<option value="SRV" data-content-pattern="[0-9]+\s+[0-9]+\s+[0-9]+\s+\S+">SRV</option>