Use intra_ext_tx_cdf with CONFIG_EC_MULTISYMBOL.

Change-Id: I21785bec0563299b4b0c1d17aaaa788e4e8df4d7
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index a42435a..60e2fbf 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -1225,7 +1225,7 @@
                         &ext_tx_encodings[mbmi->tx_type]);
 #endif
       } else {
-#if CONFIG_DAALA_EC
+#if CONFIG_EC_MULTISYMBOL
         aom_write_symbol(
             w, av1_ext_tx_ind[mbmi->tx_type],
             cm->fc->intra_ext_tx_cdf[tx_size]