[fix] opensearxh.xml: firefox v123 does not except self-URI (URL with param)

Before this patch we had a address in the rel-self-template with params [1]:

GET::

    <Url method="GET"
         rel="self"
         template="/opensearch.xml?method=GET&amp;autocomplete=google"
         type="application/opensearchdescription+xml"/>

POST::

    <Url method="POST"
         rel="self"
         template="/opensearch.xml?method=POST&amp;autocomplete=google"
         type="application/opensearchdescription+xml"/>

The first one (GET) is no longer accepted by firefox since v123, the latter one
was always been wrong (since it mixes GET params with a POST request).

Since Firefox v123 a template syntax [2] in the rel-self-template is no longer
supported / Firefox will report an error::

    Firefox could not download the search plugin from:
    http://127.0.0.1:8888//opensearch.xml?method=GET&autocomplete=google

This patch reduce the URL to::

    template="http://127.0.0.1:8888/opensearch.xml"

[1] https://github.com/dewitt/opensearch/blob/master/opensearch-1-1-draft-6.md#url-rel-values
[2] https://github.com/dewitt/opensearch/blob/master/opensearch-1-1-draft-6.md#opensearch-url-template-syntax

Closes: https://github.com/searxng/searxng/issues/3227
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

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