Change to recode rules.
Change to recode rules.

Allow recodes for the first inter frame in each arf group
even when the recode rule is set to ALLOW_RECODE_KFARFGF.

Small gains of 0.05%.

Change-Id: I40cb559d36a2bf0ebf5cf758c3f92e452b480577

mwgoldsmith/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,webmproject/libvpx,Topopiccione/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,Topopiccione/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,Topopiccione/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,webmproject/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx