...and clean up some other (legitimate) uses of UInt32ToSVBT32 to not use a
(somewhat misleading) static_cast<long>(...)

Change-Id: Ifd0c3f771c3f6e20eef3413b9c27fd2514dc0c13
Reviewed-on: https://gerrit.libreoffice.org/68767
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>