Add styles for nested "draw:*" elements when cloning master pages.

Previously only the top-level `draw:*` elements were styled.
Current code at least in OdfCanvas has a mixture of going via `domUtils` or directly to manipulate group of elements, with no obvious rules for when what is used. Added #736 to have that solved :) For now the current code in the PR matches some existing code, so fine to keep it as is.