mw.Target: Removed unreachable badtoken recovery code

This code caught badtoken errors on load, but we can't get those
any more since the API module was split and we no longer send a token
on load. badtoken handling on save is done in mw.ViewPageTarget.

Bug: 51253
Change-Id: Idb172ee46b7142681d41e593eacd9600b8f11a9a
Merge "mw.Target: Removed unreachable badtoken recovery code"