fdo#84405 TRACK CHANGES: New icons for the changes toolbar

Change-Id: I28c4677df53137d46cd103fe224a2747bc56e5ed
Reviewed-on: https://gerrit.libreoffice.org/11681
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>