Mark Air/Water temp field red for wrong input.

As a warining for the user mark the field red.
If the user inputs invalid input that will be ignored
while parsing.
But with adding a one character error margin to prevent it from toggling
between Red and Yellow while editing existing values, for example "After
Deleting unit and last number after '.'"

Signed-off-by: Yousef Hamza <jo.adam.93@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>