Weather API: Honor the values set for today's low/high temp

The vales passed to setTodaysHigh() and setTodaysLow() have no effect.
This patch fixes that problem. The values provided in the Builder
helper class will be actually set when the WeatherInfo object is built

Change-Id: I5f47b16a56fd577349d3b3d45ea7a753262f90ea
TICKET: CYNGNOS-2484
(cherry picked from commit 02a71cc2)