fix: env param in BrowserType.launch doesn't serialize properly to Nodejs (#612)

Author: nmashewske

playwright/_impl/_browser_type.py

@@ -138,7 +138,10 @@ async def launch_persistent_context(
 
 def normalize_launch_params(params: Dict) -> None:
     if "env" in params:
-        params["env"] = {name: str(value) for [name, value] in params["env"].items()}
+        params["env"] = [
+            {"name": name, "value": str(value)}
+            for [name, value] in params["env"].items()
+        ]
     if "ignoreDefaultArgs" in params:
         if params["ignoreDefaultArgs"] is True:
             params["ignoreAllDefaultArgs"] = True