fix python linter in YMQ tests (ydb-platform#3944)

Author: siarheivesialou

ydb/tests/functional/sqs/common/test_throttling_nonexistent_queue.py

@@ -4,11 +4,10 @@
 
 from ydb.tests.library.sqs.test_base import KikimrSqsTestBase
 
-
 throttling_exception_pattern = ".*</Message><Code>ThrottlingException</Code>.*"
 
-class TestSqsThrottlingOnNonexistentQueue(KikimrSqsTestBase):
 
+class TestSqsThrottlingOnNonexistentQueue(KikimrSqsTestBase):
 
     def test_throttling_on_nonexistent_queue(self):
         queue_url = self._create_queue_and_assert(self.queue_name, False, True)