bindings/lua: allow f:recvmsg() to receive any message

The `match` argument in f:recvmsg() restricts the function to only
receiving response messages. It would be nice to be able to receive
requests with this function for testing, so relax the default match
structure to FLUX_MATCH_ANY.

src/bindings/lua/flux-lua.c

@@ -895,11 +895,7 @@ static int l_flux_recvmsg (lua_State *L)
     flux_t *f = lua_get_flux (L, 1);
     flux_msg_t *msg;
     int type;
-    struct flux_match match = {
-        .typemask = FLUX_MSGTYPE_RESPONSE,
-        .matchtag = FLUX_MATCHTAG_NONE,
-        .topic_glob = NULL,
-    };
+    struct flux_match match = FLUX_MATCH_ANY;
 
     if (lua_gettop (L) > 1)
         match.matchtag = lua_tointeger (L, 2);