Fix costing of inter transform types

BUG=aomedia:2452

STATS_CHANGED:
The change in costing will cause encoder to produce slightly different
results, tested with --cpu-used=1 on a few sets, results are mostly
neutral (maybe a tiny gain):

	avg_psnr:	ovr_psnr:	ssim:
lowres:   -0.001	-0.003	      -0.035
midres:   -0.022	-0.012	      -0.056


Change-Id: Ia4762814c21fe85dcfc842abbf1d539e54937fb9
diff --git a/av1/encoder/rd.c b/av1/encoder/rd.c
index ec61406..d70f46c 100644
--- a/av1/encoder/rd.c
+++ b/av1/encoder/rd.c
@@ -64,7 +64,7 @@
                                               { 1, 1, 1, 1 },  // unused
                                               { 1, 1, 0, 0 },
                                               { 0, 0, 1, 0 },
-                                              { 0, 0, 0, 1 },
+                                              { 0, 1, 1, 1 },
                                             };
 
 static const int av1_ext_tx_set_idx_to_type[2][AOMMAX(EXT_TX_SETS_INTRA,