ui-shared: specify correct css class for summary tab

When introducing cgit_summary_link() in 49ecbbdd I forgot to specify the
css class. This fixes it.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-shared.c

@@ -629,7 +629,8 @@ void cgit_print_pageheader(struct cgit_context *ctx)
 
 	html("<table class='tabs'><tr><td>\n");
 	if (ctx->repo) {
-		cgit_summary_link("summary", NULL, NULL, ctx->qry.head);
+		cgit_summary_link("summary", NULL, hc(cmd, "summary"),
+				  ctx->qry.head);
 		cgit_refs_link("refs", NULL, hc(cmd, "refs"), ctx->qry.head,
 			       ctx->qry.sha1, NULL);
 		cgit_log_link("log", NULL, hc(cmd, "log"), ctx->qry.head,