for "values-size" role too, after parsing in
InternalDataProvider::createDataSequenceFromArray().
Without this, embedded bubble charts in documents(MSO) other
than spreadsheets will be empty when imported.

Also adds docx import chart2-unit-test in chart2import.cxx

Change-Id: I63168074b30090a8b7cf977eb5af443f6b9ac240
Reviewed-on: https://gerrit.libreoffice.org/40258Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>