qutebrowser: Replace defunct qwant maps with facilmap

I would love to replace it with osmapp instead but have not found a way
to send a query in a qutebrowser-enabled post format.

qutebrowser/config/searchengines.py

@@ -18,7 +18,7 @@ c.url.searchengines = {
     "l": "https://links.martyoeh.me/?searchterm={}&searchtags=",
     "lib": "http://libgen.fun/search.php?req={}",
     "man": "https://manned.org/browse/search?q={}",
-    "maps": "https://www.qwant.com/maps/?q={}",
+    "maps": "https://facilmap.org/#q={}",
     "pcw": "https://www.pcgamingwiki.com/w/index.php?search={}",
     "py": "https://pypi.org/search/?q={}",
     "r": "https://www.reddit.com/r/{}",