callback.c : less magic progress bars

1 - Explain magic numbers

2 - There was a weird off by 1 mess in the progress bar. The code supposedly
shared the width between 50 chars for text (textlen) and the rest for the
progress bar (proglen = getcols() - textlen).
But the code actually used textlen + 1 for the text and proglen - 1 for the
progress bar (with haslen=1, the progress bar was actually empty), which was
a bit confusing so I changed it.

Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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