fix #2584 - added IsDeleted columns back to Folder and File tables to preserve compatibility for SQLite

Oqtane.Shared/Models/File.cs

@@ -55,6 +55,11 @@ namespace Oqtane.Models
         /// </summary>
         public string Description { get; set; }
 
+        /// <summary>
+        /// Deprecated - not used
+        /// </summary>
+        public bool IsDeleted { get; set; }
+
         /// <summary>
         /// Object reference to the <see cref="Folder"/> object.
         /// Use this if you need to determine what <see cref="Site"/> the file belongs to. 

Oqtane.Shared/Models/Folder.cs

@@ -59,6 +59,11 @@ namespace Oqtane.Models
         /// </summary>
         public bool IsSystem { get; set; }
 
+        /// <summary>
+        /// Deprecated - not used
+        /// </summary>
+        public bool IsDeleted { get; set; }
+
         /// <summary>
         /// TODO: todoc what would this contain?
         /// </summary>