Fixes a problem on testnet where previous version history in the IAVL tree of the x/mint store caused panics on chain upgrade. The problem happens for any cosmos-sdk module that is added with the same store key as a previously removed module (x/mint in the case of Kava Testnet 16000).
A fix was added to the v0.21.0-alpha.0 upgrade handler to remove all pre-existing tree state for the x/mint module so it can be added anew from a clean state. A side effect of this is that historic state of the x/mint module will not be query-able on Kava Testnet.
No changes or side effects of this change affect mainnet. The v0.21.0 upgrade handler expected to run for the Kava 12 release remains unchanged.