Remove repeated ADAPT_SCAN_UPDATE_RATE_16 defs

Change-Id: I5c2e92469d8f87f7c565acd77f12535b3f58929a
diff --git a/av1/common/entropy.c b/av1/common/entropy.c
index 2c069ec..7f6cd0d 100644
--- a/av1/common/entropy.c
+++ b/av1/common/entropy.c
@@ -3515,10 +3515,6 @@
 #endif  // CONFIG_EC_MULTISYMBOL
 }
 
-#if CONFIG_ADAPT_SCAN
-#define ADAPT_SCAN_UPDATE_RATE_16 (1 << 13)
-#endif
-
 static void adapt_coef_probs(AV1_COMMON *cm, TX_SIZE tx_size,
                              unsigned int count_sat,
                              unsigned int update_factor) {