Refine prune_ref_frame speed feature for speeds 1,2

          Encode Time      Quality Loss(%)
Preset    Reduction(%)        (AWCY)
  1         9.07              +0.08
  2         5.95              +0.11

STATS_CHANGED

Change-Id: Ifa1b7bf1fe55f51b5ad1bbebc1a583bd0711e8aa

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 5150b47..5fdf3b3 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -266,6 +266,10 @@
     sf->use_transform_domain_distortion = boosted ? 1 : 2;
     sf->perform_coeff_opt = boosted ? 1 : 2;
     sf->use_inter_txb_hash = 0;
+    sf->prune_ref_frame_for_rect_partitions =
+        (frame_is_intra_only(&cpi->common) || (cm->allow_screen_content_tools))
+            ? 0
+            : (boosted ? 1 : 2);
   }
 
   if (speed >= 2) {
@@ -328,10 +332,6 @@
     // TODO(any): Experiment with the early exit mechanism for speeds 0, 1 and 2
     // and clean-up the speed feature
     sf->perform_best_rd_based_gating_for_chroma = 1;
-    sf->prune_ref_frame_for_rect_partitions =
-        (frame_is_intra_only(&cpi->common) || (cm->allow_screen_content_tools))
-            ? 0
-            : (boosted ? 1 : 2);
     sf->prune_comp_type_by_model_rd = boosted ? 0 : 1;
     sf->disable_smooth_intra =
         !frame_is_intra_only(&cpi->common) || (cpi->rc.frames_to_key != 1);