[fix] engine dokuwiki: basedir duplication

Dokuwiki searches behind reverse proxy had duplicate base path in the url,
creating a wrong url.

This patch exchanges string concat of URLs with urljoin [1] from urllib.parse.  This
eliminates the dual problem, while retaining the old functionality designed to
concatenate protocol, hostname and port (as base_url) with path.

[1] https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urljoin

Closes: https://github.com/searxng/searxng/issues/4598

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