Don't show the recycle bin in tree pickers/dialogs

src/Umbraco.Web/Trees/TreeControllerBase.cs

@@ -366,7 +366,7 @@ namespace Umbraco.Web.Trees
         /// <returns></returns>
         protected bool IsDialog(FormDataCollection queryStrings)
         {
-            return queryStrings.GetValue<bool>(TreeQueryStringParameters.IsDialog);
+            return queryStrings.GetValue<string>(TreeQueryStringParameters.Use) == "dialog";
         }
 
         /// <summary>

src/Umbraco.Web/Trees/TreeQueryStringParameters.cs

@@ -5,7 +5,7 @@
     /// </summary>
     internal struct TreeQueryStringParameters
     {
-        public const string IsDialog = "isDialog";
+        public const string Use = "use";
         public const string Application = "application";
         public const string StartNodeId = "startNodeId";
         //public const string OnNodeClick = "OnNodeClick";