Fix HUMMINGBIRD_FC305 current meter scale calibration (#931)

* Fix current meter scale calibration

* Update the current meter scale value to 250

Author: LYNHQQ

configs/HUMMINGBIRD_FC305/config.h

@@ -105,7 +105,7 @@
 #define DEFAULT_CURRENT_METER_SOURCE CURRENT_METER_ADC
 #define DEFAULT_VOLTAGE_METER_SOURCE VOLTAGE_METER_ADC
 #define DEFAULT_VOLTAGE_METER_SCALE  110
-#define DEFAULT_CURRENT_METER_SCALE  800
+#define DEFAULT_CURRENT_METER_SCALE  250
 #define BEEPER_INVERTED
 #define SYSTEM_HSE_MHZ 8