Update plugin to use `nfd_brand`

[wpscholar]

Is your feature request related to a problem? Please describe.

Currently, the plugin is using the mm_brand option instead of the nfd_brand option (Mojo instead of the NewFold prefix).

Describe the solution you'd like

We need to update the plugin to use the nfd_brand and remove all instances where mm_brand is used. However, we should add a filter to the nfd_brand option to use the value from mm_brand, if present, when nfd_brand is empty.