fdo#76298: sw: do not start up every OLE object on deletion

First check if it's actually a Chart embedded object; starting up
external processes on Windows for arbitrary OLEs is likely expensive.

(regression from 1ba29be90f7141077f2d079d40dffc2efd4f1a2c)

(cherry picked from commit 206848294f686a0ccf4c741d7e92a2314a88ea48)

Conflicts:
	sw/source/core/ole/ndole.cxx

Change-Id: I3c64444b6cf4d4f791cafc77ec1f9b2b0150ad1b
Reviewed-on: https://gerrit.libreoffice.org/8881
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>