files: hide non functioning code when called from a/f_s/get.php

files: hide non functioning code when called from a/f_s/get.php

The checkboxes don't work because files.js is missing. Adding it leads
to the problem that it relies on files/ajax and most of the code only
works for logged in users.

The actions div contains undefined variables and doesn't work either.

Signed-off-by: Florian Pritz <bluewind@xinu.at>