Disable use of sudo 'Defaults use_pty' for kdesu

Rik Millsrequested to merge
rikmills/kdesu:master into master

Fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1011624 and https://bugs.kde.org/show_bug.cgi?id=452532 as KDE do not seem much inclined to do so in code their end.

Already submitted to Ubuntu: https://launchpad.net/ubuntu/+source/kdesu/5.94.0-0ubuntu2

with preliminary ack from ubuntu security on their IRC channel

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