[mod] pylint all files with one profile / drop PYLINT_SEARXNG_DISABLE_OPTION

In the past, some files were tested with the standard profile, others with a
profile in which most of the messages were switched off ... some files were not
checked at all.

- ``PYLINT_SEARXNG_DISABLE_OPTION`` has been abolished
- the distinction ``# lint: pylint`` is no longer necessary
- the pylint tasks have been reduced from three to two

  1. ./searx/engines -> lint engines with additional builtins
  2. ./searx ./searxng_extra ./tests -> lint all other python files

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

searx/external_bang.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
 
 from urllib.parse import quote_plus, urlparse
 from searx.data import EXTERNAL_BANGS
@@ -53,7 +54,7 @@ def resolve_bang_definition(bang_definition, query):
     return (url, rank)
 
 
-def get_bang_definition_and_autocomplete(bang, external_bangs_db=None):
+def get_bang_definition_and_autocomplete(bang, external_bangs_db=None):  # pylint: disable=invalid-name
     if external_bangs_db is None:
         external_bangs_db = EXTERNAL_BANGS