Remove --headless used twice

debian/tests/test_phpldapadmin_web.py

@@ -16,7 +16,6 @@ class TestphpLDAPadminWeb(unittest.TestCase):
         options = webdriver.ChromeOptions()
         options.add_argument('--headless')
         options.add_argument('--no-sandbox')
-        options.add_argument('--headless')
         options.add_argument('--disable-gpu')
         options.add_argument('--disable-dev-shm-usage')
         service = Service(executable_path=r'/usr/bin/chromedriver')