[LNF KCM] make it possible to close the preview
Summary: The preview window doesn't respond to setting its visibility to false, so currently it can't actually be closed without using the task manager or another external way of closing windows. Fix the issue by triggering the window's `close()` function instead. Test Plan: Preview a theme and click on the close button, or anywhere else, or hit the Esc key Reviewers: #plasma, apol, davidedmundson Reviewed By: #plasma, davidedmundson Subscribers: ognarb, broulik, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D22543
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e3e614b1
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