CreateUndoAttrObject() create extra undo steps when using
table paint brush on table cells. Undo action for each selected
cell is processed individually in
SvxTableController::ApplyFormatPaintBrush().

Change-Id: I65034a2b510898db26a7a8ddc4b5f3b742fd9b88
Reviewed-on: https://gerrit.libreoffice.org/46729Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mark Hung <marklh9@gmail.com>