Bug 14112: Silence warnings in t/Charset.t

Bug 14112: Silence warnings in t/Charset.t

After Jonathan said this was the wrong way to correct the issue,
www.utf8-chartable.de made it clear to me that the \c3\a9 were
missing x's.

TEST PLAN
---------
1) prove t/Charset.t
   -- noise
2) apply patch
3) prove t/Charset.t
   -- no noise
4) koha qa test tools

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 4d4582566ee7d2014f30f15db4889d4cad956316)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>