remove experimental selenium flags

Author: Conengmo

tests/selenium/conftest.py

@@ -23,9 +23,8 @@ def __init__(self):
         options.add_argument("--no-sandbox")
         options.add_argument("--disable-dev-shm-usage")
         options.add_argument("--disable-gpu")
-        options.add_argument("--headless=new")
+        options.add_argument("--headless")
         options.add_argument("--window-size=1024,768")
-        options.add_argument("--test-type")
         super().__init__(options=options)
 
     def get_file(self, filepath):