Allow dolphin to format DateTime at later stage than KBalooRolesProvider
Summary:
KFileItemListWidgetInformant::roleText expected imageDateTime value to be a QDateTime but KBalooRolesProvider formatted it to QString previously, preventing KFileItemListWidgetInformant::roleText to format properly the imageDateTime
BUG: 411173
Reviewers: Dolphin, ngraham, elvisangelaccio
Reviewed By: Dolphin, ngraham
Subscribers: kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D25242