Bug 21681: Remove C4::Accounts::getcharges

Bug 21681: Remove C4::Accounts::getcharges

Test plan:
0) Do not apply the patch
1) Enable ILS-DI
2) Go to
<opac_url>/cgi-bin/koha/ilsdi.pl?service=GetPatronInfo&patron_id=51&show_fines=1
use patron with some paid and unpaid fines
3) Save the page for later usage
4) Apply the patch
5) Repeat 2 with same patron and compare the saved result with the new
one, they should be same
6) git grep getcharges should return no occurance
7) prove t/db_dependent/Accounts.t

Co-authored-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>