## Issue being fixed or feature implemented
`CDeterministicMNList` stores internally a map containing the hashes of
all properties that needed to be unique.
`pubKeyOperator` don't differ between the two schemes (legacy and
basic(v19)) but their serialisation do: hence their hash.
Because this internal map stores only hashes, then we need to
re-calculate hashes and repopulate.
So when we tried to revoke a masternode after the fork, the `ProUpRevTx`
couldn't be mined because the hash of the `pubKeyOperator` differed.
## What was done?
When retrieving a `CDeterministicMNList` for a given block, if v19 is
active for that block, then we repopulate the internal map.
## How Has This Been Tested?
Without this fix, `feature_dip3_v19.py` is failing with
`failed-calc-cb-mnmerkleroot` (Error encountered on Testnet)
## Breaking Changes
## Checklist:
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
**For repository code-owners and collaborators only**
- [x] I have assigned this pull request to a milestone
---------
Co-authored-by: pasta <pasta@dashboost.org>
Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
