Bug 23006: Cannot use inventory with barcodes containing special chars

Bug 23006: Cannot use inventory with barcodes containing special chars

If a barcode contains special characters like $, the regex in inventory
does no longer work.
This fix (as suggested by Jonathan) replaces the regex by a eq compare.

Test plan:
Pick one barcode and add a $ somewhere in the middle, say 123$456.
Include this barcode in a barcode file for inventory.
Run inventory on that file and verify that barcode was read and datelastseen
was updated. The barcode should not be reported as missing (not scanned).

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>