Slon/Static/html/admin: Make whitelist_ip a protected settings field

Just a simple QoL change, not "security" by any means.

Slon/Static/html/admin/main.html

@@ -46,7 +46,7 @@
     <div id="content" class="container main-content is-inline-block">
     </div>
     <script>
-        let obscured_setting_names = ["catbox_userhash"];
+        let obscured_setting_names = ["catbox_userhash","whitelist_ip"];
         function clearActiveLinks() {
             document.querySelectorAll("a").forEach(function (a) { a.className = ""; });
         }