Swap Trash/Delete when Shift is used while the menu is open

Summary:
Matching Dolphin.

BUG:395155

Reviewers: ngraham, broulik, davidedmundson

Reviewed By: davidedmundson

Subscribers: davidedmundson, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D16368