Regression from

    commit 0f4b3cb7
    CommitDate: Mon Aug 10 17:12:45 2015 +0200

The chart2/qa/extras/xshape/data/reference/tdf90839-?.xml
reference files were created with the then wrong default of two
decimals so need to be adapted.

For chart2/qa/extras/xshape/data/reference/tdf90839-1.xml this
meant to regenerate because of the changed positions and sizes of
labels.

Change-Id: Ib0c2c862af9399ab2af5178d01510aa5e4fff97c
Reviewed-on: https://gerrit.libreoffice.org/61826
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>