[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>

searx/shared/shared_simple.py

@@ -7,7 +7,7 @@ from . import shared_abstract
 
 class SimpleSharedDict(shared_abstract.SharedDict):
 
-    __slots__ = 'd',
+    __slots__ = ('d',)
 
     def __init__(self):
         self.d = {}