[py] remove blank lines so flake8 passes (#3255)

Author: cgoldberg

py/test/selenium/webdriver/firefox/ff_launcher_tests.py

@@ -32,7 +32,6 @@ def test_we_can_launch_multiple_firefox_instances(capabilities):
     driver3.quit()
 
 
-
 def test_launch_firefox_with_none_log_path(capabilities):
     driver = Firefox(capabilities=capabilities, log_path=None)
     driver.quit()

py/test/selenium/webdriver/marionette/mn_launcher_tests.py

@@ -31,7 +31,6 @@ def test_we_can_launch_multiple_firefox_instances(capabilities):
     driver3.quit()
 
 
-
 def test_launch_firefox_with_none_log_path(capabilities):
     driver = Firefox(capabilities=capabilities, log_path=None)
     driver.quit()