Reset delta_qindex for tpl stats calculations

Change-Id: If27263866c30d1412712ccba07afce3e55746ff8
diff --git a/av1/encoder/encode_strategy.c b/av1/encoder/encode_strategy.c
index de2e671..b157985 100644
--- a/av1/encoder/encode_strategy.c
+++ b/av1/encoder/encode_strategy.c
@@ -1161,6 +1161,7 @@
   memcpy(frame_params.remapped_ref_idx, cm->remapped_ref_idx,
          REF_FRAMES * sizeof(*cm->remapped_ref_idx));
 
+  cpi->td.mb.e_mbd.delta_qindex = 0;
 #if ENABLE_KF_TPL
   if (oxcf->pass == 2 && frame_params.frame_type == KEY_FRAME &&
       frame_params.show_frame) {