[fix] uwsgi: don't set static-expires

As long we don't have a working solution for cache busting [3][4] we should not
set an expire time in thw uWSGI config.

The default procedure in every web browser is the "304 Not Modified" [2] and
this default procedure should also be sufficient for us as long as we have not
implemented a complete alternative (cache busting) / form [1]

> By default uWSGI will add a Last-Modified [2] header to all static responses,
> and will honor the If-Modified-Since [2] request header.

[1] https://uwsgi-docs.readthedocs.io/en/latest/StaticFiles.html#setting-the-expires-headers
[2] https://developer.mozilla.org/de/docs/Web/HTTP/Status/304
[3] https://github.com/searxng/searxng/pull/4433
[4] https://github.com/searxng/searxng/issues/964

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

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