The theme select does not work when `--no-live` is set

### Environment

* Elixir version (elixir -v): 1.19.0-rc.0
* Phoenix version (mix deps): 1.18.0-rc.4
* Operating system: MAC

### Actual behavior

The theme select does not work when `--no-live` is set when doing `mix phx.new`

### Expected behavior

The theme selector is either removed when doing `--no-live` or it works with `--no-live`