Bug 38543: Do not include rowGroup asset files

Bug 38543: Do not include rowGroup asset files

rowGroup plugin is now part of the datatables.min.js bundle. We no
longer need to include its css and js files, and they no longer exist
anyway!

[2024/11/27 08:52:37] [WARN] File not found : lib/jquery/plugins/rowGroup/stylesheets/rowGroup.dataTables.min.css at /kohadevbox/koha/Koha/Template/Plugin/Asset.pm line 107
[2024/11/27 08:52:37] [WARN] File not found : lib/jquery/plugins/rowGroup/dataTables.rowGroup.min.js at /kohadevbox/koha/Koha/Template/Plugin/Asset.pm line 84.

Test plan:
Confirm that the checkouts are grouped "today" and "previous" on the
checkout page.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 4b82e00416c73a0e8a1b1e57ed453863d802bf6d)
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>
Signed-off-by: wainuiwitikapark <wainuiwitikapark@catalyst.net.nz>