Fix locking upgrade fork test

[baroooo]

Description

Locking Upgrade fork tests were failing because:

1. Locking proxy admin is owned by the multisig now
2. A subtle issue in how we handle timetraveling causing problems with brokenLine internals because we fork the current block's state, roll back to Nov 7 roll forward 3 weeks and make calculations for the month December. Which causes brokenLine.update to try updating the line for a past time if you run the test after December. (kudos to @philbow61)

This PR fixes the tests by setting up the fork test correctly and moving 30 weeks into future before starting tests

Other changes

_calculateBlocksTillNextWeek uses values from the contract now