[Slideshow] Reenable other modes
Summary: Was accidentally removed in a1cf305ffb21b8ae8bbaf4d6ce03bbaa94cff405
Test Plan: Other sort modes work
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D25157