dns: fix unbound custom options

PR: https://forum.opnsense.org/index.php?topic=3137.0
(cherry picked from commit acbd63db)

src/etc/inc/unbound.inc

@@ -209,13 +209,9 @@ EOF;
     unbound_acls_config();
 
     // Add custom Unbound options
-    if ($config['unbound']['custom_options']) {
-        $custom_options = "# Unbound custom option\n";
-        foreach (preg_split('/\s+/', $config['unbound']['custom_options']) as $ent) {
-            $custom_options .= $ent."\n";
-        }
-    } else {
-	     $custom_options = "";
+    $custom_options = '';
+    if (!empty($config['unbound']['custom_options'])) {
+        $custom_options = "# Unbound custom options\n{$config['unbound']['custom_options']}\n";
     }
 
     // Server configuration variables

src/www/services_unbound.php

@@ -242,12 +242,13 @@ include_once("head.inc");
                         </td>
                       </tr>
                       <tr class="showadv" style="display:none">
-                          <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Advanced");?></td>
-                          <td>
-                              <strong><?=gettext("Advanced");?><br /></strong>
-                              <textarea rows="6" cols="78" name="custom_options" id="custom_options"><?=$pconfig['custom_options'];?></textarea><br />
-                              <?=gettext("Enter any additional options you would like to add to the DNS Resolver configuration here, separated by a space or newline"); ?><br />
-                          </td>
+                        <td><a id="help_for_custom_options" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext('Custom options') ?></td>
+                        <td>
+                          <textarea rows="6" cols="78" name="custom_options" id="custom_options"><?=$pconfig['custom_options'];?></textarea>
+                          <div class="hidden" for="help_for_custom_options">
+                            <?=gettext("Enter any additional options you would like to add to the DNS Resolver configuration here."); ?>
+                          </div>
+                        </td>
                       </tr>
                       <tr class="showadv" style="display:none">
                         <td><a id="help_for_outgoing_interface" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Outgoing Network Interfaces"); ?></td>