Set exercise veBVM discount to 99% till end of current epoch

~190,000 BVM are currently wrapped in options not counting this weeks unclaimed emissions.

Voting incentives have been a little underwhelming so far but with more significantly more protocols on Base this week than last & many more coming potential lockers may just need a little push to commit to a 1 year lock.

This proposal gives users a chance to lock with minimal amount of WETH spent.

If a significant amount of the 190k oBVM outstanding is 1 year locked it can give more confidence to potential BVM LPs.

Prior to epoch flip the discount should be set back to 90%.