requested to merge mwestphal/paraview:live_source_internal_fixup_backport into release
LiveSource interval can be specified in the XML, however, the minimum interval of all live source is used to as the global interval.
Since the Timer is initialized to DEFAULT_INTERVAL (100ms), then seting an interval higher than 100ms had no effect.
This fixes the logic by initializing the timer to max int.
Backport of !6048 (merged)