mso_sptArc uses the current pos&size of the sector as frame rectangle
LO has used the underlaying ellipse. That has resulted in wrong shape
position and text wrap problems in Writer. The patch sets the viewBox
to the current pos&size of the sector and thus force the frame
rectangle to the same values in LO as in MS Office.
For details see bug report.

Change-Id: I039c27f57966bad25e9f2123f50728e6a15f2f7e
Reviewed-on: https://gerrit.libreoffice.org/69829
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>