Update montana open data site

[jbrown-xentity]

Related to https://github.com/GSA/datagov-deploy/issues/2320.

Also need to update data.gov s3 data file through the following process:

• Search us_states on the wordpress media page and taking the most recent (top left) file and downloading this file
• Edit the necessary fields locally
• Re-upload this edited file (you may need to utilize the workaround detailed here).
• Get the access/download link from this latest upload (view the details)
• Insert that value into the corresponding value on the settings page (in this case, us_states_open_data, found here)
• Clear the cache on cloudfront