Bug#849508: add GO BACK choice to save logs question
DISTRIB_RELEASE="9 (stretch) - installer build 20161212-00:04"
when getting to the question about saving logs,
the user is prompted with /mnt .
At this point the user wants to GO BACK to choose "open a shell" to
inspect what places are in fact mounted.
However at this point there is no GO BACK choice, only Continue!
In fact you might check for other questions that lack GO BACK to see if
they sould have it added or not.