Don't start networth forecast at balance zero

The opening balances are calculated into the eActual cell but the
forecast is based on the eForecast cell. Therefore, the opening balances
were not taken into account and the forecast graph always started out at
0 on the Y axis. Copying the opening balance value from the eActual cell
into the corresponding eForward cell solves the problem.

BUG: 391961
FIXED-IN: 5.0.1