bts/counter: replace '_' with '-' in counter names

Conform to the convention.

Change-Id: I6162694aae8d354aba318cc1acfdac108239fef0
Reviewed-on: https://gerrit.osmocom.org/103
Tested-by: Jenkins Builder
Reviewed-by: Holger Freyther <holger@freyther.de>
diff --git a/src/bts.cpp b/src/bts.cpp
index fdae1f0..03b0401 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -71,8 +71,8 @@
 	{ "rlc.ack.failed",		"RLC Ack Failed       "},
 	{ "rlc.rel.timedout",		"RLC Release Timeout  "},
 	{ "rlc.late-block",		"RLC Late Block       "},
-	{ "rlc.sent_dummy",		"RLC Sent Dummy       "},
-	{ "rlc.sent_control",		"RLC Sent Control     "},
+	{ "rlc.sent-dummy",		"RLC Sent Dummy       "},
+	{ "rlc.sent-control",		"RLC Sent Control     "},
 	{ "decode.errors",		"Decode Errors        "},
 	{ "sba.allocated",		"SBA Allocated        "},
 	{ "sba.freed",			"SBA Freed            "},