[plasma-shutdown] Avoid timeout when closing ksmserver
closeSession returns only when the task is complete, a sound API, but we need to remember to increase the timeout. If a user has unsaved changes in kate, they could handle that prompt after an indefinite period of time. We would still want to shutdown afterwards. Currently plasma-shutdown would abort if it thought ksmserver timed out. Not seen in real life, just spotted in code review.
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