We probably don't need salbtype.hxx include, but if we do we can
now change it with a more specific one - namely BitmapPalette.hxx
in most cases. This doesn't yet touch the includes in VCL.

Change-Id: Ie3067ccb2eec425650b41ce7fca48e368215f489
Reviewed-on: https://gerrit.libreoffice.org/70761
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>