sccp_masq: mark ets tables as "public"

This is neccessary, as the code will execute in the context of various
mgw_nat_usr processes (one for each signalling link).
diff --git a/src/sccp_masq.erl b/src/sccp_masq.erl
index 582c039..f5c1ea7 100644
--- a/src/sccp_masq.erl
+++ b/src/sccp_masq.erl
@@ -133,9 +133,9 @@
 	Msg.
 
 init() ->
-	Orig = ets:new(sccp_masq_orig, [ordered_set,
+	Orig = ets:new(sccp_masq_orig, [ordered_set, public,
 					{keypos, #sccp_masq_rec.digits_in}]),
-	Rev  = ets:new(sccp_masq_rev, [ordered_set,
+	Rev  = ets:new(sccp_masq_rev, [ordered_set, public,
 					{keypos, #sccp_masq_rec.digits_in}]),
 	application:set_env(mgw_nat, sccp_masq_orig, Orig),
 	application:set_env(mgw_nat, sccp_masq_rev, Rev),