Calculate should save state for mode controls

[greenfeld]

Calculate should save state in the Journal for the controls which can change how it processes input (degrees/radians) and how it shows output (scientific/engineering notation, number of digits, output base).

These controls are currently reset to defaults whenever a Calculate journal entry is resumed.

The answers shown in the history log do not appear to change on resume due to degrees/radian recalculation; but they do take the default format instead of the bases/precision used for output when originally calculating them.

Seen in OLPC 12.1.0 os11/Calculate-40.