Update _LoginPartial.Identity.cshtml with correct returnUrl (#49553)

* Update _LoginPartial.Identity.cshtml with correct returnUrl

* Remove method=post since it gets added by the form tag helper automatically

Author: danroth27

src/ProjectTemplates/Web.ProjectTemplates/content/RazorPagesWeb-CSharp/Pages/Shared/_LoginPartial.Identity.cshtml

@@ -9,7 +9,7 @@
         <a  class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Manage/Index" title="Manage">Hello @User.Identity?.Name!</a>
     </li>
     <li class="nav-item">
-        <form class="form-inline" asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="@Url.Page("/", new { area = "" })" method="post" >
+        <form class="form-inline" asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="@Url.Page("/Index", new { area = "" })">
             <button  type="submit" class="nav-link btn btn-link text-dark">Logout</button>
         </form>
     </li>