[kio] src/ioslaves/file/kauth: Do not cache root password for the whole session

[David Edmundson]

Can we keep all messages on the ML. We can only see half a conversation on
here.

> TBH I can't see how any application will bypass the prompt

A rogue plugin can call org.kde.kio.file.exec directly with kauth.  Or even
just use DBus directly.
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