Tests: restored access bits in index.t.

index.t

diff --git a/index.t b/index.t
index 43717bc..584000d 100644
--- a/index.t
+++ b/index.t
@@ -124,4 +124,6 @@
 like($t->read_file('log_not_found.log'), qr/error/, 'log_not_found');
 unlike($t->read_file('off.log'), qr/error/, 'log_not_found off');
 
+chmod(0700, "$d/forbidden");
+
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