Expose poll_maximum_options to client
Expose poll_maximum_options to client

At present this doesn't actually seem to be exposed to the client.

I discovered this by accident whilst trying to write my own plugin:

https://github.com/discourse/discourse/blob/7b6d6b76eb3b7dbf1982c382a1f0e981e7ff8eee/app/models/site_setting.rb#L17-L18
natefinch/discourse,natefinch/discourse