Bug 27776: Remove default sort order of sales table

Bug 27776: Remove default sort order of sales table

This patch drops the default sort on table initialisation so that the
table remains sorted in the order in which items are added unless the
user explicitly chooses to apply a sort order.

We also correct a mistake in the targets for disabling sorting on the
'Actions' column and update the hidden 'CODE' column to use the same
syntax as the other definitions for consistency.

Test plan
1/ Enable the point of sale system and set some debit types to allow
sale.
2/ Navigate to the point of sale page and added some items to sell
3/ Update the price for a few lines and note the sort order does not
change.
4/ Update the quantity for a few lines and note the sort order does not
change.
5/ Sort a column using the headers and note it works
6/ Signoff

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>