Enable simple_motion_search_prune_rect on speed 0

This commit enables simple_motion_search_prune_rect on speed 0.

Performance:
 OVR_PSNR | AVG_SPDUP | AVG_SPEDUP:OVR_PSNR
  0.076%  |   8.265%  |       108.8:1

OVR_PSNR is measured on midres set over 60 frames. Speed is measured on
5 midres clips over 4 bitrates 30 frames.

STATS_CHANGED

Change-Id: I63b1ab4abca81fd236614aca72c5539fa359b433
diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 992b2f5..1916dcc 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -213,6 +213,7 @@
   sf->ml_prune_rect_partition = 1;
   sf->ml_prune_ab_partition = 1;
   sf->ml_prune_4_partition = 1;
+  sf->simple_motion_search_prune_rect = 1;
   sf->adaptive_txb_search_level = 1;
   sf->use_dist_wtd_comp_flag = DIST_WTD_COMP_SKIP_MV_SEARCH;
   sf->model_based_prune_tx_search_level = 1;
@@ -270,7 +271,6 @@
     sf->prune_single_motion_modes_by_simple_trans = 1;
 
     sf->simple_motion_search_split_only = 1;
-    sf->simple_motion_search_prune_rect = 1;
 
     sf->disable_wedge_search_var_thresh = 0;
     sf->disable_wedge_search_edge_thresh = 0;