vp9: Fix condition for limiting ARF 1 pass vbr.
vp9: Fix condition for limiting ARF 1 pass vbr.

Fix the setting to frames_till_gf_update_due, and
adjust the limit value.
Only affects when USE_ALTREF_FOR_ONE_PASS is enabled.

Neutral change to metrics and speed for ytlive.

Change-Id: I266d9a00b36221bc8602fa2746d4e8a8f7d4dfae

webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx