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Fix bug when overlaying middle arfs in multi-arf groups.

Fix copied over from VP9 master to VP10 master.
Do not reset the alt ref active flag when overlaying the middle
arf(s) of a multi arf group.

Change-Id: I1b7392107e7c675640d5ee1624012f39cc374c58

--- a/vp10/encoder/ratectrl.c

+++ b/vp10/encoder/ratectrl.c

@@ -1210,8 +1210,12 @@

     rc->frames_since_golden = 0;

     // If we are not using alt ref in the up and coming group clear the arf

-    // active flag.

-    if (!rc->source_alt_ref_pending) {

+    // active flag. In multi arf group case, if the index is not 0 then

+    // we are overlaying a mid group arf so should not reset the flag.

+    if (cpi->oxcf.pass == 2) {

+      if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0))

+        rc->source_alt_ref_active = 0;

+    } else if (!rc->source_alt_ref_pending) {

       rc->source_alt_ref_active = 0;

     }