[fix] simple theme: make autocomplete-js CSP compliant

The CSP issue is, that the `_Position` function in the autocomplete-js set the
style attributes by `setAttribute("style", ...)`.  Using `setAttribute` to set
the style attribute invokes the HTML parser and CSP is triggered [1].

This patch overwrite the `_Position` function of autocomplete-js.

BTW: remove trailing whitespace

[1] https://stackoverflow.com/a/57633533

Closes: https://github.com/searxng/searxng/issues/352


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