[kio_applications] Fix last dir item being shown twice

Summary:
During porting to the new KIO::SlaveBase::listEntry() API accidentally
the listEntry(entry, true) was turned into a listEntry(), where it
should have been just removed in favour of an existing finished() call.
See 0853202b0cfb688add4f021708830710e1b84931

Test Plan: applications: and programs: no longer show the last entry twice

Reviewers: Plasma, chinmoyr

Reviewed By: chinmoyr

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D18641