Bug 10127 : Printoverdues.sh should tar only pdf files

Bug 10127 : Printoverdues.sh should tar only pdf files

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
From the bug report:
At the end of printoverdues.sh, an archive is generated
containing all files present in  directory given as parameter.
As archives are generated in this given directory, they
contain previously generated tar files, creating oversized files.
Only .pdf files should be archived

All tests and QA script pass.
Worked ok in my tests, only packign PDF in the given directory.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>