Always create new OLE objects with reference count of 1, not 0.

Always create new OLE objects with reference count of 1, not 0.

There are no real changes but ensure that the new objects of classes using
DECLARE_OLE_UNKNOWN() macro are created with valid reference count of 1
instead of being created in phantom state with reference count of 0.

Remove the now unnecessary AddRef() and add the now required DecRef() calls.

See #11566.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65912 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775