oox/source/export/presetShapeDefinitions.xml had
multiple entries for "upDownArrow" instead of an entry
for "upArrow".
Whereas drawingml/customshapes/presetShapeDefinitions.xml
has correct entries.

Changed CustomTarget_generated.mk to use
drawingml/customshapes/presetShapeDefinitions.xml instead of
oox/source/export/presetShapeDefinitions.xml. Also deleted the latter
to avoid duplication.

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx
Reviewed on:
	https://gerrit.libreoffice.org/8540

Change-Id: Ic46496af7fb79edf0780b04731a882d914e89a24