Ensure explorer and status reset on workflow clear

Author: glopesdev

Bonsai.Editor/EditorForm.cs

@@ -835,6 +835,7 @@ void ClearWorkflow()
             saveWorkflowDialog.FileName = null;
             workflowBuilder.Workflow.Clear();
             editorControl.ResetNavigation();
+            editorSite.ValidateWorkflow();
             visualizerSettings.Clear();
             ResetProjectStatus();
             UpdateTitle();