Update button rendering, move css classes to viewdata

WebCms/Views/Shared/DisplayTemplates/_DeleteForm.cshtml

@@ -1,17 +1,15 @@
 @using LeafWeb.WebCms.Controllers
-@model Tuple<int, string, bool, bool>
+@using LeafWeb.WebCms.Utility
+@model Tuple<int, string>
 @{
     var leafInputId = Model.Item1;
     var identifier = Model.Item2;
-    var isDeletable = Model.Item3;
-    // true for a link, false for a button
-    var buttonType = Model.Item4 ? "btn-link" : "btn-outline-secondary";
 }
 @using (Html.BeginUmbracoForm<QueueController>("Delete", null, 
     new { @class = "confirm clearfix", confirm_msg = "Deletion cannot be undone! Confirm deleting '" + identifier + "'." }))
 {
     <input type="hidden" name="id" value="@leafInputId"/>
-    <button type="submit" class="btn @buttonType" @{if (!isDeletable) { <text> disabled="disabled" </text>  }}>
+    <button type="submit" @Html.Partial("DisplayTemplates/_ViewDataCssClass") @if(ViewData.IsButtonDisabled()) {<text>disabled</text>}>
         <span class="fa fa-remove"></span> Delete
     </button>
 }