Hyperlink inserted to chart lost after export.

chart_hyperlink.xlsx: Test file from Excel 2016.

Change-Id: Ideca10e544193ba43d7c2ef6e9dd8e393383edc1
Reviewed-on: https://gerrit.libreoffice.org/70648
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>