Fix the condition of recode when PVQ enabled

The definition of TX_SIZES has changed after nextgenv2 is merged,
which included non-square transforms. TX_SIZES is used as part of
condition doing recode in tx_size/type RDO when PVQ is enabled.

Change-Id: I9a66a72f0f4391eb375290aa0dabc638c68c6c68

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 2b85472..7ebecf8 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -1772,9 +1772,8 @@
   if (mbmi->tx_size >= TX_32X32) assert(mbmi->tx_type == DCT_DCT);
 #endif
 #if CONFIG_PVQ
-  if (best_tx < TX_SIZES) {
-    RD_STATS this_rd_stats;
-    txfm_rd_in_plane(x, cpi, &this_rd_stats, ref_best_rd, 0, bs, best_tx,
+  if (best_rd != INT64_MAX) {
+    txfm_rd_in_plane(x, cpi, rd_stats, ref_best_rd, 0, bs, best_tx,
                      cpi->sf.use_fast_coef_costing);
   }
 #endif