P0.04 is a digital power-enable pin for the NTC/LUX sensors, not an ADC
input. The old code was calling analogRead() on a floating GPIO that
happened to read ~mid-rail, coincidentally producing reasonable
temperature values.
- Rename T1000X_VCC_PIN to T1000X_SENSOR_EN_PIN and drive it HIGH in
initVariant() for both T1000-E and T1000-S variants
- Read BATTERY_PIN (with ADC_MULTIPLIER) instead, clamped to the 3.0V
LDO output (NTC_REF_VCC) for the NTC resistance calculation