CLEANUP: http/tcp actions: remove the scope member

The scope member is not used. This patch removes this entry.
diff --git a/src/vars.c b/src/vars.c
index 5a2a572..d233c88 100644
--- a/src/vars.c
+++ b/src/vars.c
@@ -766,22 +766,22 @@
 	{ /* END */ },
 }};
 
-static struct tcp_action_kw_list tcp_req_kws = {"vars", { }, {
+static struct tcp_action_kw_list tcp_req_kws = { { }, {
 	{ "set-var", parse_tcp_req_store, 1 },
 	{ /* END */ }
 }};
 
-static struct tcp_action_kw_list tcp_res_kws = {"vars", { }, {
+static struct tcp_action_kw_list tcp_res_kws = { { }, {
 	{ "set-var", parse_tcp_res_store, 1 },
 	{ /* END */ }
 }};
 
-static struct http_req_action_kw_list http_req_kws = {"vars", { }, {
+static struct http_req_action_kw_list http_req_kws = { { }, {
 	{ "set-var", parse_http_req_store, 1 },
 	{ /* END */ }
 }};
 
-static struct http_res_action_kw_list http_res_kws = {"vars", { }, {
+static struct http_res_action_kw_list http_res_kws = { { }, {
 	{ "set-var", parse_http_res_store, 1 },
 	{ /* END */ }
 }};