fdo#79733 fix icon's path

Change-Id: I5ff2dff8a98bff61fcc0adddb3d23aa6b5f81078
(cherry picked from commit 1fc42f217100d69c4cef6a72b63752da0fdca995)
Reviewed-on: https://gerrit.libreoffice.org/9855
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>