If timer is not restarted on each request, the update can end up
happening before the next frame has been rendered. This can happen e.g.
at puppet startup, where the delay between first request and first
frame render can easily be more than 16ms.
Change-Id: Ib9555548e8c60799c585d0ab43d0626cfa31a494
Fixes: QDS-2082
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>