Fixed flake8 warnings

Author: Relrin

sage_utils/amqp/extension.py

@@ -49,4 +49,4 @@ async def deinit(self, loop):
 
         setattr(self.app, self.app_attribute, None)
         extensions = getattr(self.app, 'extensions', {})
-        extensions.pop(self.extension_name, None)
+        extensions.pop(self.extension_name, None)

tests/amqp/test_worker.py

@@ -1,4 +1,3 @@
-import asyncio
 from unittest import mock
 
 import pytest