[mod] engines: migrate to setup() from init() for simple tasks

searx/engines/luxxle.py

@@ -51,7 +51,7 @@ enable_http2 = False
 safe_search_map = {0: "Off", 1: "Moderate", 2: "Strict"}
 
 
-def init(_):
+def setup(_: dict[str, t.Any]) -> bool | None:
     if luxxle_categ not in ("search", "images", "videos", "news"):
         raise ValueError("invalid luxxle category: %s" % luxxle_categ)