Change return value of calculate_current_inflation_rate so that it return percents
Current behavior:
Example:
>>> print(calculate_current_inflation_rate(10))
978 # hive percent (has to be divided by 100)
Should return :
>>> print(calculate_current_inflation_rate(10))
9.78
It would be more consistent with other function like :
>>> print(calculate_hp_apr(100, 100, Asset.hive(1), Asset.hive(1)))
0.9 # actual percent