Fixed the console errors

Author: Swapnamol

LearningHub.Nhs.WebUI/Views/Shared/Tenant/LearningHub/_Layout.cshtml

@@ -71,7 +71,7 @@
         <partial name="_CookieConsentPartial" />
     </div>
 
-    <header class="nhsuk-header" role="banner">
+    <header class="nhsuk-header" role="banner" id="header">
     <div id="content-header">
         <partial name="~/Views/Shared/_NavPartial.cshtml" />
     </div>