Detect wake word model from index.json (#1211)

* detect wake word model from index.json

* update wait time before entering wifi configure mode

main/boards/xmini-c3-v3/xmini_c3_board.cc

@@ -43,11 +43,7 @@ private:
     }
 
     void InitializePowerSaveTimer() {
-#if CONFIG_USE_ESP_WAKE_WORD
         power_save_timer_ = new PowerSaveTimer(160, 300);
-#else
-        power_save_timer_ = new PowerSaveTimer(160, 60);
-#endif
         power_save_timer_->OnEnterSleepMode([this]() {
             GetDisplay()->SetPowerSaveMode(true);
         });