delphi: Reactivate dashboard control when a new layout is set

`TdxDashboardControl.Clear` makes the control inactive, so that it does
not show any content (TdxDashboardControl.Active == False).

Author: NickVolynkin

Delphi/uMainForm.pas

@@ -82,6 +82,8 @@ procedure TMainForm.LoadLayoutAndState;
   dxDashboardControl1.Layout.Assign(DataModule1.mdLayoutsLayout);
   if not DataModule1.mdLayoutsState.IsNull then
     dxDashboardControl1.State.Assign(DataModule1.mdLayoutsState);
+  
+  dxDashboardControl1.Active := True;
 end;
 
 procedure TMainForm.btnDeleteClick(Sender: TObject);