bq27441: remove redundant try/except in current_average()

[Copilot]

current_average() wrapped its call in a try/except Exception: raise block — catching only to re-raise, which is a no-op.

Change

Replaced with a direct return, consistent with all other methods in the same class:

# Before
def current_average(self):
    """Return average current"""
    try:
        result = self.current(CurrentMeasureType.AVG)
        return result
    except Exception:
        raise

# After
def current_average(self):
    """Return average current"""
    return self.current(CurrentMeasureType.AVG)

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