Fix logic error in kioclient noninteractive argument handling
Summary:
If noninteractive /is/ set s_interactive should be false.
When s_interactive is true we show dialog and kuiserver notifications.
This was a porting bug.
Given fixing would result in a behavioural change, the default behaviour
is swapped to remain the same as the previous broken version and an
explicit --interactive flag is added.
Test Plan:
Ran a test that should produce an error without passing --noninteractive
It produced an error notification.
Reviewers: Plasma, nerdopolist, dfaure
Reviewed By: dfaure
Subscribers: broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D17652