aide: fix default DB/config location

Without specifying otherwise, aide will look in $out/etc for its
configuration file and database. Since this is immutable, changing it to
/etc allows it to be usable.

pkgs/tools/security/aide/default.nix

@@ -17,6 +17,7 @@ stdenv.mkDerivation rec {
     "--with-posix-acl"
     "--with-selinux"
     "--with-xattr"
+    "--sysconfdir=/etc"
     ];
 
   meta = with lib; {