Bug 36035: Wrong text colour in addorderiso2709.pl

Bug 36035: Wrong text colour in addorderiso2709.pl

This patch updates the "Order staged MARC records" page so that the
class which is added upon selection is more unique to avoid a collision
with some default DataTables styles. These classes are used in
JavaScript selectors, not for visual style.

The patch also adds some custom CSS variables to global.scss to override
the defaults for the DataTables "selected" style, in case this issue
crops up again.

To test, apply the patch and rebuild the staff interface CSS. Follow the
test plan from the bug report:

1) In system preferences, click Search and then select the Acquisitions
   option from the left hand menu
2) Paste the following into MarcFieldsToOrder

price: 975$p
quantity: 975$q
budget_code: 975$h

3) Paste the following into MarcItemFieldsToOrder

homebranch: 949$a
holdingbranch: 949$b
itype: 949$y
nonpublic_note: 949$x
public_note: 949$z
loc: 949$c
ccode: 949$8
notforloan: 949$7
uri: 949$u
copyno: 949$t
price: 949$g
replacementprice: 949$v
itemcallnumber: 949$o
quantity: 949$k
budget_code: 949$l

4) Save the sysprefs
5) Navigate to acquisitions and go into a basket
6) Click "Add to basket" and select "From a new file"
7) Download the file attached to this bug
8) Import the file and when the job is complete click "Add staged files
   to basket"
9) Click the checkbox next to the record to display the items.
   - The expanded form should look correct.
10) Add one or more items to the order and confirm that submitting the
    form works correctly.

To test the new default "selected" DataTables style, view a page with a
DataTable, e.g. Administration -> Libraries.

- Right-click on one of the table rows and choose "Inspect"
- Click the table row element, e.g. '<tr class="odd">'
- Double-click the class name and replace it with "selected."
- The row you inspected should now have a pale green background and text
  colors should remain the same.

Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>