bq27441: remove no-op try/except blocks from driver

[Copilot]

Two try/except Exception: raise blocks in device.py were pure noise — catching only to immediately re-raise with no added context or recovery.

Changes

• power_up(): removed wrapper around set_capacity(), call is now direct
• current_average(): removed wrapper and intermediate variable, simplified to a direct return

# Before
def power_up(self):
    self.disable_shutdown_mode()
    sleep_ms(10)
    try:
        self.set_capacity(self.capacity_mAh)
    except Exception:
        raise

def current_average(self):
    try:
        result = self.current(CurrentMeasureType.AVG)
        return result
    except Exception:
        raise

# After
def power_up(self):
    self.disable_shutdown_mode()
    sleep_ms(10)
    self.set_capacity(self.capacity_mAh)

def current_average(self):
    return self.current(CurrentMeasureType.AVG)

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