Remove D10890 workaround
Summary:
D10890 was a workaround related to KRecentDocument::add() bug (see D10863)
which is fixed in Frameworks 5.46. Given that Plasma 5.13 depends on that
Frameworks version, it's safe to remove this no longer needed workaround
without breaking anything.
Reviewers: Plasma, broulik, hein
Reviewed By: Plasma, hein
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D12701