Revert "Add hidserv-stats filname to our sandbox filter"

Reverting this in 0.2.6 only -- we're no backporting
seccomp2-loosening fixes to 0.2.6.

This reverts commit 2ec5e24c.

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

@@ -3018,7 +3018,6 @@ 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");