Method ready

Marlin/src/module/temperature.cpp:4047–4054

    uint8_t state_timer_heater;
    inline void dec() { if (state_timer_heater > 0) state_timer_heater--; }
    inline bool ready(const bool v) {
      const bool rdy = !state_timer_heater;
      if (rdy && state_heater != v) {
        state_heater = v;
        state_timer_heater = MIN_STATE_TIME;
      }
      return rdy;
    }
  #endif
};