Compile fix for f9ef4f6bcd9e.

Automatic rebasing didn't pick up that an extra instance of the
EC_SMALLMUL flag was added in commit 8711cf5f341d.

However, that commit also broke CONFIG_ANS, since the CDF
probabilities are not inverted in that case. This patch fixes both
issues.

Change-Id: I85b3eb8a4be5b7a392f2f872fc4a90f3fdbf2727
diff --git a/av1/common/onyxc_int.h b/av1/common/onyxc_int.h
index 709956d..3ce47b4 100644
--- a/av1/common/onyxc_int.h
+++ b/av1/common/onyxc_int.h
@@ -893,7 +893,7 @@
 
 static INLINE aom_cdf_prob cdf_element_prob(const aom_cdf_prob *cdf,
                                             size_t element) {
-#if CONFIG_EC_SMALLMUL
+#if !CONFIG_ANS
   return (element > 0 ? cdf[element - 1] : CDF_PROB_TOP) - cdf[element];
 #else
   return cdf[element] - (element > 0 ? cdf[element - 1] : 0);