Drop extra RIGIDBOT_PANEL from D6 config

Marlin/src/config/examples/Wanhao/Duplicator 6/Configuration.h

@@ -1551,12 +1551,6 @@
 //#define RIGIDBOT_PANEL
 
 //
-// RigidBot Panel V1.0
-// http://www.inventapart.com/
-//
-//#define RIGIDBOT_PANEL
-
-//
 // Makeboard 3D Printer Parts 3D Printer Mini Display 1602 Mini Controller
 // https://www.aliexpress.com/item/Micromake-Makeboard-3D-Printer-Parts-3D-Printer-Mini-Display-1602-Mini-Controller-Compatible-with-Ramps-1/32765887917.html
 //