Allow blocked users to edit their own user talk page

When $wgBlockAllowsUTEdit = true; and a user is banned via
Special:Block but allowed to edit their user page, let them
edit their user page.

Bug: 65457
Change-Id: I2c6e8b83d7b83c98e9b4d9834830d0fd955ff6fd
Merge "Allow blocked users to edit their own user talk page"