Add hidserv-stats filname to our sandbox filter

Fixes #17354

Signed-off-by: David Goulet <dgoulet@ev0ke.net>

changes/bug17354

+  o Minor bugfixes (sandbox):
+    - Add the "hidserv-stats" filename to our sandbox filter for the
+      HiddenServiceStatistics option to work properly. Fixes bug 17354;
+      bugfix on tor-0.2.6.2-alpha~54^2~1. Patch from David Goulet.

src/or/main.c

@@ -3018,6 +3018,7 @@ sandbox_init_filter(void)
     RENAME_SUFFIX2("stats", "exit-stats", ".tmp");
     RENAME_SUFFIX2("stats", "buffer-stats", ".tmp");
     RENAME_SUFFIX2("stats", "conn-stats", ".tmp");
+    RENAME_SUFFIX2("stats", "hidserv-stats", ".tmp");
     RENAME_SUFFIX("hashed-fingerprint", ".tmp");
     RENAME_SUFFIX("router-stability", ".tmp");