MeatPack followup - unused command (#20893)

Marlin/src/feature/meatpack.cpp

     case MPCommand_QueryConfig:     break;
     case MPCommand_EnablePacking:   SBI(state, MPConfig_Bit_Active);   DEBUG_ECHOLNPGM("[MPDBG] ENA REC");   break;
     case MPCommand_DisablePacking:  CBI(state, MPConfig_Bit_Active);   DEBUG_ECHOLNPGM("[MPDBG] DIS REC");   break;
-    case MPCommand_TogglePacking:   TBI(state, MPConfig_Bit_Active);   DEBUG_ECHOLNPGM("[MPDBG] TGL REC");   break;
     case MPCommand_ResetAll:        reset_state();                     DEBUG_ECHOLNPGM("[MPDBG] RESET REC"); break;
     case MPCommand_EnableNoSpaces:
       SBI(state, MPConfig_Bit_NoSpaces);

Marlin/src/feature/meatpack.h

  */
 enum MeatPack_Command : uint8_t {
   MPCommand_None            = 0,
-  MPCommand_TogglePacking   = 0xFD,
   MPCommand_EnablePacking   = 0xFB,
   MPCommand_DisablePacking  = 0xFA,
   MPCommand_ResetAll        = 0xF9,