Resolves: fdo#62682 crash on second export of svg

because the first export has left "dangling" CalcFieldValueHdl Links in
Outliners that got created based on the Drawing Outliner while it had a
temporary CalcFieldValueHdl installed, and didn't get the old CalcFieldValueHdl
installed when the old Drawing Outliner one was re-installed.

(cherry picked from commit 5bdfa8c12472eb9ff6ca054c2ada7150b1869fff)

Change-Id: I064a154ece488c9a4c3467b753451df7e73ae883
Reviewed-on: https://gerrit.libreoffice.org/12009
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>