Allow statusbar and information panel to stat with KIO::StatRecursiveSize
Summary: Needed after D28901 to ensure we get the UDS_RECURSIVE_SIZE out of the stat calls.
Test Plan: Trash size is visible in status bar and information panel again.
Reviewers: ngraham, dfaure, Dolphin
Reviewed By: dfaure
Subscribers: kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D28950