Dotfiles persistent feature is broken on Jessie

Symlinks point to /lib/live/mount/persistence/TailsData_unlocked/dotfiles/, but /lib/live/mount/persistence/ does not exist. We should either add a symlink to make this still work, or point to /live/persistence/ instead.

Feature Branch: bugfix/persistence-fixes-for-2.0-take1

Related issues

Related to #10840 (closed)

Original created by @intrigeri on 10784 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information