...instead of its export-only part com.sun.star.comp.oox.ExcelFilterExport (for
which even a new-style service com.sun.star.oox.ExcelFilterExport has been
introduced recently, but all of this should probably go away again; that this
filter is used explicitly is probably a rare enough scenario to not warrant a
dedicated new-style service).

The modified code in ShapeExport::WriteOLE2Shape is triggered e.g. with a
Presetation, insert a Spreadsheet as an OLE Object, and save as "Office Open XML
Presentation (.pptx)."

Change-Id: Id2645972caaec5265eed645c9c6e2c308a4d079d