[Bug 797215] tagdemux: Use upstream GST_EVENT_STREAM_START if present

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797215

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 373786
  --> https://bugzilla.gnome.org/attachment.cgi?id=373786&action=edit
tagdemux: Use upstream GST_EVENT_STREAM_START if present

If we have an upstream GST_EVENT_STREAM_START, use that one instead
of creating a new one which could be completely different from the
upstream one and drop information (like the stream flags and stream
object).

Only create a new event if we don't already have one from upstream

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