[fix] jinja/babel: WithExtension and AutoEscapeExtension are built-in now.

[1] https://github.com/pallets/jinja/pull/1544

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

babel.cfg

@@ -3,5 +3,4 @@ searxng_msg = searx.babel_extract.extract
 [ignore: **/node_modules/**]
 [python: **.py]
 [jinja2: **/templates/**.html]
-extensions=jinja2.ext.autoescape,jinja2.ext.with_
 [searxng_msg: **/searxng.msg]