Motivation
The option "Also block the given user locally on this wiki" (default unchecked) in Global blocking is easy to miss and does not serve the purpose of globally blocking a user.
Based on a discussion with the stewards about this on Discord we need to make some amendments here. We'll block the user from meta except from their talk page -- allowing for appeals to be possible.
Spec
- When globally blocking an IP/range/user - block them on meta with by default allowing access to their user talk page
- Remove the option "Also block the given user locally"
- Add an option to "Block user from their meta talk page" (unchecked by default)

