cache: id means static, even if head is specified too

Pages like /commit?h=wip&id=8a335ce618ba77fbf05148d6f8be17bd48ba4340
were being marked as dynamic, because of h=wip, when it should be
static, because of id=.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

cgit.c

@@ -928,12 +928,12 @@ static int calc_ttl()
 	if (!strcmp(ctx.qry.page, "about"))
 		return ctx.cfg.cache_about_ttl;
 
-	if (ctx.qry.has_symref)
-		return ctx.cfg.cache_dynamic_ttl;
-
 	if (ctx.qry.has_sha1)
 		return ctx.cfg.cache_static_ttl;
 
+	if (ctx.qry.has_symref)
+		return ctx.cfg.cache_dynamic_ttl;
+
 	return ctx.cfg.cache_repo_ttl;
 }