Enable wrapping of error messages which use KMessageWidget
Summary: Error messages should be shown to users no matter how much long it is.
Reviewers: VDG, Plasma, Frameworks, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: davidedmundson, ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28200