Bug 31808: Set fieldset.rows li width to 100%

Bug 31808: Set fieldset.rows li width to 100%

To test:
1. Find an item and try placing a hold.
2. Under 'Hold details' the first list element is the patron name, it displays far to the right in an unusual location.
3. Apply patch and regenerate CSS ( https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_interface )
4. Try steps 1 & 2 again.
5. The name should display correctly.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>