sms: Remove the commented out code that was the default in OpenBSC

This code got copied from OpenBSC and we used the network specific
and private numbering plan. Remove it as it can be easily set.
diff --git a/src/gsm/gsm0411_utils.c b/src/gsm/gsm0411_utils.c
index ebde8fc..fe69bf4 100644
--- a/src/gsm/gsm0411_utils.c
+++ b/src/gsm/gsm0411_utils.c
@@ -273,7 +273,6 @@
 	if (strlen(number) > 20)
 		number = "";
 
-//	oa[1] = 0xb9; /* networks-specific number, private numbering plan */
 	oa[1] = 0x80 | (type << 4) | plan;
 
 	len_in_bytes = gsm48_encode_bcd_number(oa, oa_len, 1, number);