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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

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -1500,9 +1500,7 @@

   rc->max_gf_interval = 16;

   // Extended interval for genuinely static scenes

-  rc->static_scene_max_gf_interval = oxcf->key_freq >> 1;

-  if (rc->static_scene_max_gf_interval > (MAX_LAG_BUFFERS * 2))

-    rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;

+  rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;

   if (is_altref_enabled(cpi)) {

     if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)