chore: fix typo

src_data/dashboard.html

@@ -287,7 +287,7 @@
 
         document.querySelector('#thermostat-dhw-enabled').addEventListener('change', (event) => {
           modifiedTime = Date.now();
-          newSettings.heating.dhw = event.currentTarget.checked;
+          newSettings.dhw.enable = event.currentTarget.checked;
         });
 
         setTimeout(async function onLoadPage() {

src_data/settings.html

@@ -116,9 +116,7 @@
                   <small>Default: 23</small>
                 </label>
               </div>
-            </fieldset>
 
-            <fieldset>
               <mark>After changing this settings, the ESP must be restarted for the changes to take effect.</mark>
             </fieldset>