[bug] Redirect after rename doesn't use DOKU_BASE

I have a dokuwiki behind an nginx reverse proxy. This means I rely on DOKU_BASE being used wherever necessary.
It's a minor inconvenience because the rename works correctly, but the redirect that follows it does not.

When I rename a page with this move plugin, I get redirected to 0.0.0.0:8091. If DOKU_BASE is defined, the plugin should make use of it in order to preform the correct redirect.
