Large canvas not downsized properly when running wasm build in mobile on itch.io

I'm having trouble with the canvas overflowing when using this template targeting mobile devices and publishing on itch.io.

I'm quite sure the change in this PR https://github.com/bevyengine/bevy_github_ci_template/pull/44 previously fixed the issue and properly resized the canvas to fit smaller screens, by adding the css

```

html, body {margin:0;height:100%;}

```

and configuring the window plugin to use `fit_canvas_to_parent: true`.

But something has changed 🤔 and this does not seem to help anymore as a canvas/window with dimensions larger then the target device will overflow and only show a cropped center part of the canvas/window content, when running on mobile on itch.io.

Anyone having the same issue (with itch.io in particular) and have found a workaround / fix?

Empieza reproduciendo la compilación WASM publicada en un dispositivo móvil a través de itch.io y, después, compara el comportamiento de su canvas con la configuración de PR 44. Comprueba primero la configuración mostrada de CSS y window plugin; se considera terminado cuando el canvas se ajusta al dispositivo objetivo sin desbordamiento ni contenido recortado.

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