Fix battery ADC channel enum conversion error

Author: williamd1k0

src/utility/Power_Class.h

@@ -14,7 +14,7 @@
 #define POWER_LED_PIN  2
 
 #define BAT_ADC_PIN     38
-#define BAT_ADC_CHANNEL ADC1_GPIO38_CHANNEL
+#define BAT_ADC_CHANNEL ADC1_CHANNEL_2
 
 #define BASE_VOLATAGE     3600
 #define SCALE             0.661
@@ -33,4 +33,4 @@ class Power_Class {
     void timerSleep(const rtc_date_t& date, const rtc_time_t& time);
 };
 
-#endif
+#endif