#48 Upgrade quicksilverd to v1.6.4

This proposal aims to upgrade Quicksilver quicksilver-2 mainnet to v1.6.4 of quicksilverd.\n\nThis upgrade resolves a state issue that was unexpected introduced as a result of proposal 47.\n\nAdditionally, it resolves an issue with CL pool claims, and large redelegations on 1e18 denom assets. Further details can be found here: https://github.com/quicksilver-zone/quicksilver/releases/tag/v1.6.4