Bug 37466: Add correct filter for sort_by in results.tt

Bug 37466: Add correct filter for sort_by in results.tt

This patch replaces the $raw filter with the correct uri filter
for the sort_by in results.tt

Test plan:
1. Apply patch
2. Go to /cgi-bin/koha/catalogue/search.pl?count=20&sort_by=popularity_dsc&idx=kw&q=1
3. Click on "Edit this search"
4. Note that the "Popularity (most to least)" Sort by option is selected
5. Go to /cgi-bin/koha/catalogue/search.pl?count=20&sort_by=popularity_dsc&idx=kw&q=24y24ty2498294t9824yt9y23
6. Click on "Edit this search"
7. Note that the "Popularity (most to least)" Sort by option is selected

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>