Extend prune_mesh_search to speed 4

Extended speed feature prune_mesh_search to speed 4

cpu-used  Instruction Count     BD-Rate Loss(%)
           Reduction(%)     avg.psnr  ovr.psnr  ssim
   4       2.090            0.0205    0.0189    0.0011

STATS_CHANGED

Change-Id: Ibf74fd0cae4c07b339bf296695c96cf1bca7b65f

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 2711760..57d121f 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1066,6 +1066,7 @@
     sf->intra_sf.skip_intra_in_interframe = 4;
 
     sf->mv_sf.simple_motion_subpel_force_stop = HALF_PEL;
+    sf->mv_sf.prune_mesh_search = 1;
 
     sf->tpl_sf.subpel_force_stop = HALF_PEL;
     sf->tpl_sf.search_method = FAST_BIGDIA;
@@ -1117,8 +1118,6 @@
         frame_is_intra_only(&cpi->common) ? 0 : 1;
     sf->lpf_sf.disable_lr_filter = 1;
 
-    sf->mv_sf.prune_mesh_search = 1;
-
     sf->tpl_sf.prune_starting_mv = 3;
     sf->tpl_sf.use_y_only_rate_distortion = 1;
     sf->tpl_sf.subpel_force_stop = FULL_PEL;