[format.python] initial formatting of the python code

This patch was generated by black [1]::

    make format.python

[1] https://github.com/psf/black

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

tests/unit/test_webadapter.py

@@ -25,7 +25,6 @@ SEARCHQUERY = [EngineRef(PRIVATE_ENGINE_NAME, 'general')]
 
 
 class ValidateQueryCase(SearxTestCase):
-
     @classmethod
     def setUpClass(cls):
         searx.search.initialize(TEST_ENGINES)