MINOR: http_act: Remove code relying on the legacy HTTP mode

Actions updating the request or the response start-line are concerned.
diff --git a/src/http_act.c b/src/http_act.c
index 0653dd5..495ba55 100644
--- a/src/http_act.c
+++ b/src/http_act.c
@@ -62,8 +62,8 @@
 				       replace->size - replace->data,
 				       &rule->arg.http.logfmt);
 
-	http_replace_req_line(rule->arg.http.action, replace->area,
-			      replace->data, px, s);
+	htx_req_replace_stline(rule->arg.http.action, replace->area,
+			       replace->data, px, s);
 
 	ret = ACT_RET_CONT;
 
@@ -148,12 +148,7 @@
 	output  = alloc_trash_chunk();
 	if (!replace || !output)
 		goto leave;
-
-	if (IS_HTX_STRM(s))
-		uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
-	else
-		uri = ist2(ci_head(&s->req) + s->txn->req.sl.rq.u, s->txn->req.sl.rq.u_l);
-
+	uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
 	if (!regex_exec_match2(rule->arg.act.p[1], uri.ptr, uri.len, MAX_MATCH, pmatch, 0))
 		goto leave;
 
@@ -167,7 +162,7 @@
 		goto leave;
 
 	/* 3 is the set-uri action */
-	http_replace_req_line(3, output->area, len, px, s);
+	htx_req_replace_stline(3, output->area, len, px, s);
 
 	ret = ACT_RET_CONT;
 
@@ -220,7 +215,7 @@
 static enum act_return action_http_set_status(struct act_rule *rule, struct proxy *px,
                                               struct session *sess, struct stream *s, int flags)
 {
-	http_set_status(rule->arg.status.code, rule->arg.status.reason, s);
+	htx_res_set_status(rule->arg.status.code, rule->arg.status.reason, s);
 	return ACT_RET_CONT;
 }