TransactionSequence: cancel all subjobs on rollback-from-user.
Summary: This replaces commit f14a6e99 which wasn't the right fix for the same problem. Test Plan: F5 in a large folder in kmail, then pressing the Abort button in the middle of the sync. It used to just block the sync, while now it's possible to resume afterwards. Reviewers: dvratil, vkrause Reviewed By: dvratil Subscribers: kde-pim Differential Revision: https://phabricator.kde.org/D19488
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