Fix the Cron job to deduplicate files

The script was not executed, because it did not pass the "sanity checks": https://stackoverflow.com/a/43454485

the files under these directories have to be pass some sanity checks including the following: be executable, be owned by root, not be writable by group or other and, if symlinks, point to files owned by root. Additionally, the file names must conform to the filename requirements of run-parts: they must be entirely made up of letters, digits and can only contain the special signs underscores ('_') and hyphens ('-'). Any file that does not conform to these requirements will not be executed by run-parts. For example, any file containing dots will be ignored.

Furthermore, because it was a symlink, the actual script would not correctly detect the directory it was in.

Simplify things by making a regular script that call outs script instead of a symlink.