Bug 27673: Fix encoding issues

Bug 27673: Fix encoding issues

There is a difference between YAML::Load and YAML::XS::Load
From YAML::XS pod:
"YAML::XS only deals with streams of utf8 octets"

Test plan:
We are going to test 1 occurence and QA will confirm others don't
contain typos.
0. Don't apply the patches
1. Create a new itemtype with code=❤️
2. Create a new item using this itemtype (to biblionumber=1 will work)
3. Fill OpacHiddenItems with
 itype: [❤️]
4. Search for "street shuffle" or any terms that will return the biblio
Notice that the item is there (there is an error in logs)
5. Apply the patches
6. Repeat 4 and confirm that the item is now hidden

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>