When on low Voltage also Shutdown IMU before going to deepSleep

[unlogisch04]

Don't think this feature is used often but i found that we should power down all components before going to deep sleep.

SlimeVR-Tracker-ESP/src/batterymonitor.cpp

Lines 120 to 124 in c29b7bd

	#if defined(BATTERY_LOW_VOLTAGE_DEEP_SLEEP) && BATTERY_LOW_VOLTAGE_DEEP_SLEEP
	ESP.deepSleep(0);
	#else
	statusManager.setStatus(SlimeVR::Status::LOW_BATTERY, true);
	#endif