bash completion usually completes boolean options that default to `true`
with the `=false` suffix because that is the only syntax that really
changes behavior.
For this option, I implemented completion falsely.
Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit fc0dafbbd1)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>