When a shiny app is running under a prefix (root_path in ASGI terms),
the static files are not served correctly under pyodide.
This is because the ASGI path includes the prefix, and the root_path
should be removed.
Starlette 0.33 and 0.34 however, did not set root_path correctly,
and in those cases, we have to rely on route_path.

Related discussions:
 Kludex/starlette#2400
 Kludex/starlette#2361

A related fix we had in Solara:
 widgetti/solara#413

But this fix also did not seem to work for our situation at https://py.cafe

I logged the output of the relevant entries in the scope dict, together
with the starlette version:

```
scope 0.32.0 {'path': '/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
scope 0.33.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '', 'route_root_path': '/lib/strftime-0.9.2', 'route_path': '/strftime-min.js'}
scope 0.34.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '', 'route_root_path': '/lib/strftime-0.9.2', 'route_path': '/strftime-min.js'}
scope 0.35.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
scope 0.36.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
scope 0.37.2 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
```

This was using a similar situation as on py.cafe:
```python
....
routes = [
    Mount('/static', app=app_static),
    Mount('/_app', app=app_shiny)
]

app = Starlette(routes=routes)
```

Which led me to the following fix, making shiny work under pyodide
in combination with a prefix with the above mentioned versions of starlette.

When a shiny app is running under a prefix (root_path in ASGI terms),
the static files are not served correctly under pyodide.
This is because the ASGI path includes the root_path, and the root_path
should be removed.
Starlette 0.33 and 0.34 however, did not set root_path correctly,
and in those cases, we have to rely on route_path.

Related discussions:
 Kludex/starlette#2400
 Kludex/starlette#2361

A related fix we had in Solara:
 widgetti/solara#413

But this fix also did not seem to work for our situation at https://py.cafe

I logged the output of the relevant entries in the scope dict, together
with the starlette version:

```
starlette 0.32.0 {'path': '/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
starlette 0.33.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '', 'route_root_path': '/lib/strftime-0.9.2', 'route_path': '/strftime-min.js'}
starlette 0.34.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '', 'route_root_path': '/lib/strftime-0.9.2', 'route_path': '/strftime-min.js'}
starlette 0.35.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
starlette 0.36.0 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
starlette 0.37.2 {'path': '/_app/lib/strftime-0.9.2/strftime-min.js', 'root_path': '/_app/lib/strftime-0.9.2'}
```

This was using a similar situation as on py.cafe:
```python
....
routes = [
    Mount('/static', app=app_static),
    Mount('/_app', app=app_shiny)
]

app = Starlette(routes=routes)
```

Which led me to the following fix, making shiny work under pyodide
in combination with a prefix with the above mentioned versions of starlette.