CppunitTest_sw_rtfimport: indentation fixes

Change-Id: I696489a60729426b9b14df6c9e79a2d8247d21fb
DOCX import: handle <w:numId> from parent styles as well

Without this, we may miss the <w:numId> of a paragraph and set no
numbering style name; and that leads to not restarting numberings when
needed.

Change-Id: I9a4896266c5b7f1d7cc2adc43b84e227c004da7c