refactor(gov): remove usage of v1.ValidatorGovInfo (#7)

This type was used to hold the validator vote and its delegation
deductions. Now that vote inheritance is disabled, we don't need to hold
these values any more, we can just use the type returned by the staking
keeper.

x/gov/keeper/tally.go

@@ -20,43 +20,23 @@ func (keeper Keeper) Tally(ctx sdk.Context, proposal v1.Proposal) (passes bool,
 	results[v1.OptionNoWithVeto] = math.LegacyZeroDec()
 
 	totalVotingPower := math.LegacyZeroDec()
-	currValidators := make(map[string]v1.ValidatorGovInfo)
+	currValidators := make(map[string]stakingtypes.ValidatorI)
 
 	// fetch all the bonded validators, insert them into currValidators
 	keeper.sk.IterateBondedValidatorsByPower(ctx, func(index int64, validator stakingtypes.ValidatorI) (stop bool) {
-		currValidators[validator.GetOperator().String()] = v1.NewValidatorGovInfo(
-			validator.GetOperator(),
-			validator.GetBondedTokens(),
-			validator.GetDelegatorShares(),
-			math.LegacyZeroDec(),
-			v1.WeightedVoteOptions{},
-		)
-
+		currValidators[validator.GetOperator().String()] = validator
 		return false
 	})
 
 	keeper.IterateVotes(ctx, proposal.Id, func(vote v1.Vote) bool {
-		// if validator, just record it in the map
 		voter := sdk.MustAccAddressFromBech32(vote.Voter)
-
-		valAddrStr := sdk.ValAddress(voter.Bytes()).String()
-		if val, ok := currValidators[valAddrStr]; ok {
-			val.Vote = vote.Options
-			currValidators[valAddrStr] = val
-		}
-
-		// iterate over all delegations from voter, deduct from any delegated-to validators
+		// iterate over all delegations from voter
 		keeper.sk.IterateDelegations(ctx, voter, func(index int64, delegation stakingtypes.DelegationI) (stop bool) {
 			valAddrStr := delegation.GetValidatorAddr().String()
 
 			if val, ok := currValidators[valAddrStr]; ok {
-				// There is no need to handle the special case that validator address equal to voter address.
-				// Because voter's voting power will tally again even if there will be deduction of voter's voting power from validator.
-				val.DelegatorDeductions = val.DelegatorDeductions.Add(delegation.GetShares())
-				currValidators[valAddrStr] = val
-
 				// delegation shares * bonded / total shares
-				votingPower := delegation.GetShares().MulInt(val.BondedTokens).Quo(val.DelegatorShares)
+				votingPower := delegation.GetShares().MulInt(val.GetBondedTokens()).Quo(val.GetDelegatorShares())
 
 				for _, option := range vote.Options {
 					weight, _ := sdk.NewDecFromStr(option.Weight)