ec_smallmul: Relax tell test.

The small multiplier intentionally introduces a larger error, so
relax the accuracy threshold in the aom_reader_tell_frac() test.

Change-Id: Ib046a95dd3a8498a1a2ea58680796e75fd195868

test/boolcoder_test.cc

@@ -92,7 +92,11 @@ TEST(AV1, TestBitIO) {
 }
 
 #if CONFIG_DAALA_EC
+#if CONFIG_EC_SMALLMUL
+#define FRAC_DIFF_TOTAL_ERROR 0.16
+#else
 #define FRAC_DIFF_TOTAL_ERROR 0.07
+#endif
 #else
 #define FRAC_DIFF_TOTAL_ERROR 0.2
 #endif