Reset use default tx type flag before evaluating intra_bc/palette

Reset use_default_inter_tx_type and use_default_intra_tx_type flags
appropriately before evaluating intra_bc/palette mode.

            Encode Time
cpu-used     Reduction      Quality Loss
   4           0.0%           -0.03%
   5           0.0%           +0.02%

STATS_CHANGED

Change-Id: I2d01f7cee9cad6c72830f22b512f8df85c780657
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index ff1a3c8..1e6bfa2 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -11009,6 +11009,7 @@
       get_rd_opt_coeff_thresh(cpi->coeff_opt_dist_threshold, 0, 0);
   // Set the transform size search method for mode evaluation
   set_tx_size_search_method(cpi, x, 0, 0);
+  x->use_default_intra_tx_type = 0;
 
   if (intra_yrd < best_rd) {
     // Only store reconstructed luma when there's chroma RDO. When there's no
@@ -13175,6 +13176,8 @@
       get_rd_opt_coeff_thresh(cpi->coeff_opt_dist_threshold, 0, 0);
   // Set the transform size search method for winner mode processing
   set_tx_size_search_method(cpi, x, 0, 0);
+  x->use_default_intra_tx_type = 0;
+  x->use_default_inter_tx_type = 0;
 
   // Only try palette mode when the best mode so far is an intra mode.
   const int try_palette =