Remove useless container widget around mFolderTreeWidget.
Summary: Clearly this was from before the search lineedit moved into FolderTreeWidget. Found in Gammaray. Test Plan: KMail looks fine; didn't try re-enabling the search lineedit though (didn't find the setting) Reviewers: mlaurent, #kde_pim Reviewed By: mlaurent, #kde_pim Subscribers: kde-pim Tags: #kde_pim Differential Revision: https://phabricator.kde.org/D2129
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