Revert "for consistency"

This reverts commit e8c7bb3a.

src/mod/applications/mod_conference/mod_conference.c

@@ -5248,7 +5248,7 @@ static void conference_xlist(conference_obj_t *conference, switch_xml_t x_confer
 
 	switch_xml_set_attr_d(x_conference, "name", conference->name);
 	switch_snprintf(i, sizeof(i), "%d", conference->count);
-	switch_xml_set_attr_d(x_conference, "member_count", ival);
+	switch_xml_set_attr_d(x_conference, "member-count", ival);
 	switch_snprintf(i, sizeof(i), "%u", conference->rate);
 	switch_xml_set_attr_d(x_conference, "rate", ival);
 	switch_xml_set_attr_d(x_conference, "uuid", conference->uuid_str);