coding: fix decoding of EFR triplicated bits

In GSM 05.03 channel coding for EFR, there are 4 bits out of the
244-bit EFR codec frame that are triplicated before FR-like encoding,
and the decoder needs to apply a 2-out-of-3 majority voting function
to each of these triplicated bits after the FR-like decoding step.
For one of those 4 bits, this majority voting function was wrong
in the decoder implemented in gsm0503_tch_fr_decode() - fix it.

Change-Id: I47def75cdb066ed6372df4567404cc828589ed53
diff --git a/src/coding/gsm0503_coding.c b/src/coding/gsm0503_coding.c
index 07c8c98..1ef6393 100644
--- a/src/coding/gsm0503_coding.c
+++ b/src/coding/gsm0503_coding.c
@@ -1804,7 +1804,7 @@
 	s[119] = (sum >= 2);
 	memcpy(s + 121, w + 125, 53);
 	sum = s[172] + w[178] + w[179];
-	s[172] = (sum > 2);
+	s[172] = (sum >= 2);
 	memcpy(s + 174, w + 180, 50);
 	sum = s[222] + w[230] + w[231];
 	s[222] = (sum >= 2);