tdf#75256 sifr icons for the startcenter part 1

I'm adding 32px version of the startcenter icons.
Have to do the recentfiles icon later.

Change-Id: I4794a9900dd6b74f27853648768667456bc0a862
Reviewed-on: https://gerrit.libreoffice.org/19135Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>