Enable E1 stepper for DUAL_NOZZLE_DUPLICATION_MODE

Marlin/planner.cpp

       switch(extruder) {
         case 0:
           enable_E0();
-          #if ENABLED(DUAL_X_CARRIAGE)
+          #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(DUAL_NOZZLE_DUPLICATION_MODE)
             if (extruder_duplication_enabled) {
               enable_E1();
               g_uc_extruder_last_move[1] = (BLOCK_BUFFER_SIZE) * 2;