Merge branch 'bugfix/IsProtected-disable-delete' into release/5.1.0

Fixed a bug in #35 where the 'Delete' button was still being displayed if `IsProtected` was set on a topic.

Author: JeremyCaney

OnTopic.Editor.AspNetCore/Areas/Editor/Views/Shared/_Toolbar.cshtml

@@ -44,7 +44,7 @@
     <!-- /Export -->
 
     <!-- Delete -->
-    @if (!Model.IsNew && !Model.ContentTypeDescriptor.DisableDelete || Model.Topic.IsProtected) {
+    @if (!Model.IsNew && !Model.ContentTypeDescriptor.DisableDelete && !Model.Topic.IsProtected) {
       <a
         id                      ="DeletePageButton"
         data-title              ="@Model.Topic.Title?.Replace("\"", "&quot;")"