DOCX drawingML import: fix remaining rotation / flip combinations

With this, each rotation = 0 / 90 / 180 / 270 and flip = none /
horizontal / vertical / horizontal+vertical combination (16 cases) are
imported perfectly.

Also adjust a few testcases -- now that in many cases we only set the
position in oox, some rounding errors went away.

Change-Id: I5567a7d6964775f2caf10a0e539f3eb84d10461e