Turn model based tx search pruning on for speed 1+

Turn the feature on for speed 1.

About 0.5-1% speed-up by instruction count with noise level
performance difference in speed 1.

STATS_CHANGED

Change-Id: I93997775ef14bc0eeb493ee5e15be64c16eb0999

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 062a605..faeb7af 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -255,7 +255,6 @@
     sf->skip_repeat_interpolation_filter_search = 1;
     sf->tx_type_search.skip_tx_search = 1;
     sf->tx_type_search.ml_tx_split_thresh = 40;
-    sf->model_based_prune_tx_search_level = 0;
     sf->adaptive_txb_search_level = 2;
     sf->use_intra_txb_hash = 1;
     sf->optimize_b_precheck = 1;
@@ -313,6 +312,7 @@
     sf->cb_pred_filter_search = 0;
     sf->adaptive_interp_filter_search = 1;
     sf->perform_coeff_opt = boosted ? 0 : 2;
+    sf->model_based_prune_tx_search_level = 0;
   }
 
   if (speed >= 3) {
@@ -479,7 +479,6 @@
     sf->skip_repeat_interpolation_filter_search = 1;
     sf->tx_type_search.skip_tx_search = 1;
     sf->tx_type_search.ml_tx_split_thresh = 40;
-    sf->model_based_prune_tx_search_level = 0;
     sf->adaptive_txb_search_level = 2;
     sf->use_intra_txb_hash = 1;
     sf->optimize_b_precheck = 1;
@@ -529,6 +528,7 @@
     sf->prune_comp_type_by_comp_avg = 2;
     sf->cb_pred_filter_search = 0;
     sf->adaptive_interp_filter_search = 1;
+    sf->model_based_prune_tx_search_level = 0;
   }
 
   if (speed >= 3) {