Stats Insights: Remove social (publicize) subscribers

[staskus]

Total Subscribers number on Insights is calculated by adding: wpcom + email + publicize (Jetpack social) subscribers. However, it's been removed from the web.

1. Update Total Subscribers card on Insights not to add publicize numbers
2. Update Total Subscribers -> Details to remove "Social" from Subscribers table

[dangermattic]

Thanks for reporting! 👍