updateUi() updated for currentBmr.

When the day elapsed, activeBmr was being used to calculate the calorie
bank which was originally intended to be in terms of the goal weight, or
whatever is selected, but this is being used to calculated estimated
weight loss, so has been adjusted to be calories burned per day via
currentBmr minus calories eaten so it can reflect weight loss.  An
update will be made to the bank later for a better feature set.