tools: fix forAdvisory

`Security.Advisories.Filesystem.forAdvisory` needs updating to match
the updated (again) filenames in the repo re-org.

Also update the filenames in the `reserved/` directory.

Author: frasertweedale

advisories/reserved/HSEC-2024-0004.md renamed to advisories/reserved/2024/HSEC-2024-0004.md

@@ -163,7 +163,7 @@ _forFilesByYear root go = do
         then do
           files <- liftIO $ listDirectory yearDir
           for files $ \file ->
-            case parseHsecId ("HSEC-" <> year <> "-" <> dropExtension file) of
+            case parseHsecId (dropExtension file) of
               Nothing -> pure mempty
               Just hsid -> go (yearDir </> file) hsid
         else pure mempty