battery_status.msg: remove unused fields (PX4#22938)

Signed-off-by: Silvan Fuhrer <[email protected]>

msg/BatteryStatus.msg

@@ -66,12 +66,8 @@ uint8 BATTERY_MODE_COUNT = 3 # Counter - keep it as last element (once we're ful
 
 uint8 MAX_INSTANCES = 4
 
-float32 average_power               # The average power of the current discharge
-float32 available_energy            # The predicted charge or energy remaining in the battery
 float32 full_charge_capacity_wh     # The compensated battery capacity
 float32 remaining_capacity_wh       # The compensated battery capacity remaining
-float32 design_capacity             # The design capacity of the battery
-uint16 average_time_to_full         # The predicted remaining time until the battery reaches full charge, in minutes
 uint16 over_discharge_count         # Number of battery overdischarge
 float32 nominal_voltage             # Nominal voltage of the battery pack