stm32/adc: Fix ADCAll.read_core_temp() on L4 MCUs.
TS_CAL1 and TS_CAL2 of STM32L4 are at VDDA=3.0V, so the reference correction factor should be updated before reading tempsensor.
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TS_CAL1 and TS_CAL2 of STM32L4 are at VDDA=3.0V, so the reference correction factor should be updated before reading tempsensor.