More pylint 2 fixes (#15565)

## Description:

More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).

## Checklist:
  - [ ] The code change is tested and works locally.
  - [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**

tests/components/binary_sensor/test_ffmpeg.py

@@ -7,7 +7,7 @@ from tests.common import (
     get_test_home_assistant, assert_setup_component, mock_coro)
 
 
-class TestFFmpegNoiseSetup(object):
+class TestFFmpegNoiseSetup:
     """Test class for ffmpeg."""
 
     def setup_method(self):
@@ -72,7 +72,7 @@ class TestFFmpegNoiseSetup(object):
         assert entity.state == 'on'
 
 
-class TestFFmpegMotionSetup(object):
+class TestFFmpegMotionSetup:
     """Test class for ffmpeg."""
 
     def setup_method(self):

tests/components/binary_sensor/test_workday.py

@@ -12,7 +12,7 @@ from tests.common import (
 FUNCTION_PATH = 'homeassistant.components.binary_sensor.workday.get_date'
 
 
-class TestWorkdaySetup(object):
+class TestWorkdaySetup:
     """Test class for workday sensor."""
 
     def setup_method(self):