Bug 12613: Remove CGI::scrolling_list from koha2marclinks.pl

Bug 12613: Remove CGI::scrolling_list from koha2marclinks.pl

This patch removes all (2) instances from koha2marclinks.pl.
Also changes dropdowns width on mapping editor, from an
ugly ragged right to a fixed width view.

To test:
1. Apply the patch
2. Go to Administration > Koha to MARC mapping
3. Pulldown in this view has been replaced, check
for regressions: change table type and press Ok,
verify you get Koha fields and tag/subfield appropriate
for each table.
4. Now press 'Edit' on any field, go into mapping editor
5. Check that all pulldowns show tag/subtags relevant
for each group ( 000s ... 900s )
6. Check that current mapping is displayed correctly
7. Check for regressions: unmap, remap, press Ok,
verify, change again.
8. If you can, check display of mapping editor on several
browsers, just in case.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
I have tested with Firefox/Iceweasel only.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script.
Also tested in Chromium.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>