To compress saved preferences in the URL was introduced in 5f758b2d3 and
slightly fixed in 8f4401462. But the main fail was not fixed; The decompress
function returns a binary string and this binary should first be decoded to a
string before it is passed to urllib.parse_qs.
BTW: revert the hot-fix from 5973491
Related-to: https://github.com/searxng/searxng/issues/166
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>