`group_vars/matrix_servers` was correctly populating `matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci_auto` with a list, but:
- the defaults for these variables were hinting that hashmaps are necessary
- merging of `_auto` and `_custom` was done as if for hashmaps, not lists
As a result, `/.well-known/matrix/client` looked like this:
```json
{
"org.matrix.msc4143.rtc_foci": {
"livekit_service_url": "https://matrix.example.com/livekit-jwt-service",
"type": "livekit"
}
}
```
.. instead of what's expected as per MSC4143 (https://github.com/matrix-org/matrix-spec-proposals/pull/4143):
```json
{
"org.matrix.msc4143.rtc_foci": [
{
"livekit_service_url": "https://matrix.example.com/livekit-jwt-service",
"type": "livekit"
}
]
}
```
Regardless of our incorrectly formatted `org.matrix.msc4143.rtc_foci`
configuration in `/.well-known/matrix/client`, Element Web still seemed
to be able to discover LiveKit JWT Service (and by extension, LiveKit Server) correctly,
even without this fix.
c9951194fe