Bug 32167: (bug 14860 follow-up) Populate price fields even if no discount on vendor

Bug 32167: (bug 14860 follow-up) Populate price fields even if no discount on vendor

On bug 14860 an 'else' was removed, assuming the price fields were set before discount,
this was incorrect. This patch renames the variable and always set the price, only discounting
ecost if a discount, but setting the values even if not

To test:
 0 - Have a vendor with a discount of 0% specified (no discount)
 1 - Export a record from your Koha
 2 - Stage the record for import and match on biblionumber
 3 - Add to a basket in acq from the staged file
 4 - Select the title, and set order price to $10 and do not fill the discount field
 5 - Add the order - note $0 order line
 6 - Repeat with another vendor with a 10% discount and confirm that is correct
 7 - Apply patch
 8 - Repeat 2-4
 9 - Add the order and confirm $10 price
10 - Repeat with discounted vendor, confirm prices are set discounted correctly

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>