print download link for reference string length == 1

I have a number of repositories that start tagging with just '1' and
count up. Actually references with sting length of one are skipped, this
patch changes that.
diff --git a/ui-refs.c b/ui-refs.c
index 147b665..e8e308e 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -105,7 +105,7 @@
 	const char *basename;
 	int free_ref = 0;
 
-	if (!ref || strlen(ref) < 2)
+	if (!ref || strlen(ref) < 1)
 		return;
 
 	basename = cgit_repobasename(repo->url);