🐛 Address ActionView::Template::Error

I'm seeing the following in Sentry:

```
ArgumentError
wrong number of arguments (given 1, expected 2)
```

With this commit, we factor towards the correct arity while also
allowing additional parameters.

app/helpers/blacklight/blacklight_helper_behavior.rb

@@ -331,7 +331,7 @@ def document_index_view_type(query_params = params)
  #
  # @param [String] format suffix
  # @yield
- def with_format(format, _block)
+ def with_format(format, *, &block)
  old_formats = formats
  self.formats = [format]
  yield