fdo#75256 Improve sifr icontheme

Modify wraptext to match tango, add missing sc_delete.png

Change-Id: Ifa4622bd63675204d5e5e9c6ad4d89a1b783d542
Reviewed-on: https://gerrit.libreoffice.org/12468
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>