The new implementation overshoots less often, runs generally faster,
and correctly forwards exceptions thrown by the checkScreen callback.
Signed-off-by: Carlos Rafael Giani <crg7475@mailbox.org>
There's no reason to use the full navigation function to switch from the
TBR percentage to the TBR duration screen, since these are next to each
other, and switching over is done by pressing MENU once.
Signed-off-by: Carlos Rafael Giani <crg7475@mailbox.org>
