AV1 RT: Bring back TX type search for mid and hires

Tests show ~2% degradation for high and mid res becasue of TX type
search reduction. Limit it to low res only

Change-Id: I487dd326ae03daf45def98a6ecc7db44bf965954
diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 827aec4..4ef3d46 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -249,6 +249,7 @@
   (void)is_720p_or_larger;  // Not used so far
 
   if (!is_360p_or_larger) {
+    if (speed >= 6) sf->rt_sf.force_tx_search_off = 1;
     if (speed >= 8) sf->rt_sf.use_nonrd_filter_search = 0;
   }
   if (is_360p_or_larger) {
@@ -824,7 +825,6 @@
     sf->lpf_sf.cdef_pick_method = CDEF_PICK_FROM_Q;
     sf->lpf_sf.lpf_pick = LPF_PICK_FROM_Q;
 
-    sf->rt_sf.force_tx_search_off = 1;
     sf->rt_sf.mode_search_skip_flags |= FLAG_SKIP_INTRA_DIRMISMATCH;
     sf->rt_sf.num_inter_modes_for_tx_search = 5;
     sf->rt_sf.skip_interp_filter_search = 1;