fdo#81750 MM: correctly convert inline-edit fields

The new inline-editable input fields contain real content in the
node, therefore a single SwPaM::Move isn't sufficient to select
the field or move after the field.
For the input fields we can directly go to the end of the field.

Change-Id: Ic1bce415ce45e49456121b6db003ded0733e195c
Reviewed-on: https://gerrit.libreoffice.org/10834
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>