Fix resolver warning message not being displayed in setup.

setup/static/render.js

@@ -83,7 +83,7 @@ $(document).ready(function() {
 			$("#ipv6").hide();
 		}
 	});
-	$("#unbound").change(function() {
+	$("#resolver_enabled").change(function() {
 		if ($(this).is(":checked")) {
 			$("#unbound").hide();
 		} else {

setup/templates/steps/compose/03_expose.html

@@ -43,7 +43,7 @@ avoid generic all-interfaces addresses like <code>0.0.0.0</code> or <code>::</co
 <div class="form-check form-check-inline">
   <p>The unbound resolver enables Mailu to do DNSSEC verification, DNS root lookups and caching. This also helps the antispam service not to get blocked by the public or ISP DNS servers.</p>
   <label class="form-check-label">
-    <input class="form-check-input" type="checkbox" name="resolver_enabled" value="true" checked>
+    <input class="form-check-input" type="checkbox" id="resolver_enabled" name="resolver_enabled" value="true" checked>
     Enable an internal DNS resolver (unbound)
   </label>
 </div>