fix: change SimulationState.InitialStake to sdkmath.Int (cosmos#11855)

* fix: change SimulationState.InitialStake to sdkmath.Int

* cl

* aleks' suggestion

Author: facundomedica

state.go

@@ -11,6 +11,7 @@ import (
 	tmjson "github.com/tendermint/tendermint/libs/json"
 	tmtypes "github.com/tendermint/tendermint/types"
 
+	sdkmath "cosmossdk.io/math"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
 	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
@@ -147,10 +148,13 @@ func AppStateRandomizedFn(
 
 	// generate a random amount of initial stake coins and a random initial
 	// number of bonded accounts
-	var initialStake, numInitiallyBonded int64
+	var (
+		numInitiallyBonded int64
+		initialStake       sdkmath.Int
+	)
 	appParams.GetOrGenerate(
 		cdc, simappparams.StakePerAccount, &initialStake, r,
-		func(r *rand.Rand) { initialStake = r.Int63n(1e12) },
+		func(r *rand.Rand) { initialStake = sdkmath.NewInt(r.Int63n(1e12)) },
 	)
 	appParams.GetOrGenerate(
 		cdc, simappparams.InitiallyBondedValidators, &numInitiallyBonded, r,