`import marimo` changes in `py:marimo` notebooks in Marimo 0.19.6

[mwouts]

We are seeing errors like this one on the CI:

>           raise AssertionError("\n" + diff)
E           AssertionError: 
E           --- expected
E           +++ actual
E           @@ -2,6 +2,12 @@
E            
E            __generated_with = "0.19.6"
E            app = marimo.App()
E           +
E           +
E           +@app.cell
E           +def _():
E           +    import marimo as mo
E           +    return (mo,)
E            
E            
E            @app.cell
E           @@ -44,12 +50,6 @@
E                return
E            
E            
E           -@app.cell
E           -def _():
E           -    import marimo as mo
E           -    return (mo,)
E           -
E           -
E            if __name__ == "__main__":
E                app.run()

src/jupytext/compare.py:46: AssertionError
______________ test_ipynb_to_marimo[ipynb_py/plotly_graphs.ipynb] ______________