Asset depreciation board is wrong when using a different currency

[xavi]

When calculating the depreciation lines, the amount to depreciate (amount) is recalculated to the company's currency, but the residual amount, is not exchanged. So the operations for each line have mixed currencies. Not only that, for every line it's recomputed the amount in the company currency, when the exchange could have been done outside the for loop.

account_asset/account_asset.py line 172 and sequents