fix: wasm kernels don't have argv (marimo-team#5476)

We were accidentally providing an extra argument to `argv` in WASM,
which was breaking the argparse example in the docs.

Author: akshayka

marimo/_pyodide/bootstrap.py

@@ -135,7 +135,7 @@ def write_kernel_message(op: KernelMessage) -> None:
             query_params=query_params,
             filename=filename,
             cli_args={},
-            argv=[""],
+            argv=[],
             app_config=app.config,
         ),
         user_config,