[py] Copy environment on all platforms

Author: cgoldberg

py/conftest.py

@@ -313,10 +313,10 @@ def wait_for_server(url, timeout):
             "is using port {}, continuing...".format(_port)
         )
     except Exception:
+        remote_env = os.environ.copy()
         if platform.system() == "Linux":
             # There are issues with window size/position when running Firefox
             # under Wayland, so we use XWayland instead.
-            remote_env = os.environ.copy()
             remote_env["MOZ_ENABLE_WAYLAND"] = "0"
         print("Starting the Selenium server")
         process = subprocess.Popen(