Fixes the online.git HTTPWSTest::testRenderShapeSelectionImpress()
testcase by reverting one hunk of commit
3fb298f6 (lok: writer: svg export
transformed images, 2019-03-26).

This was probably meant to be a cleanup, but getting the sdr mark,
followed by getting the sdr object of the mark always gives us a shape,
while directly accessing mpMarkedObj does not.

Change-Id: Id733ba5c6fdf6fc86a3e9f7de62b4bdcbf9b06db
Reviewed-on: https://gerrit.libreoffice.org/72039Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>