Allow to display UDS_RECURSIVE_SIZE in status bar
Summary: Useful for trash:/ in particular
Test Plan:
Reviewers: Dolphin, dfaure, elvisangelaccio, ngraham
Reviewed By: Dolphin, ngraham
Subscribers: kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D28794