MS formats only have support for Table and Cell fill.

Interestingly, MS Word doesn't let the cells inherit from
the Table fill setting (even though LO docx import currently does),
so that value also needs to be written out into every cell.

Change-Id: Ib49fddf52758ff641428de747ea290d1fcb894f3
Reviewed-on: https://gerrit.libreoffice.org/59260Reviewed-by: Justin Luth <justin_luth@sil.org>
Tested-by: Justin Luth <justin_luth@sil.org>