fdo#75137: Can't Move Cursor Between Footnotes with Up/Down Arrow Keys

This fixes a regression introduced at 43941d9a5313fcd7fe39a61bd2eace64f7743486.

Change-Id: If73883569049f0f3ae8a2d40f6704f74e63eecb2
Reviewed-on: https://gerrit.libreoffice.org/13401
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>