fdo#86472 fix icons on dark theme in oxygen and sifr

Change-Id: I02f2877c5eefbadea6734b15732b46ba80cdcf37
Reviewed-on: https://gerrit.libreoffice.org/13285
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>