Change initialization of static_scene_max_gf_interval.
Change initialization of static_scene_max_gf_interval.

This removes an unnecessary restriction that causes
a problem (noticed by AWG) when the forced key frame
interval is set to a very small value, such as 10. In this case
we were being forced to code minimal length GF groups.

Change-Id: I76ef5861a09638ff51f61fea02359554184ada53

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