refactor(simapp): using maps.Clone to simplify codes (#19885)

Co-authored-by: weixie.c <weixie.c@kaitaitech.cn>

simapp/app.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"maps"
 	"os"
 	"path/filepath"
 
@@ -764,12 +765,7 @@ func (app *SimApp) RegisterNodeService(clientCtx client.Context, cfg config.Conf
 //
 // NOTE: This is solely to be used for testing purposes.
 func GetMaccPerms() map[string][]string {
-	dupMaccPerms := make(map[string][]string)
-	for k, v := range maccPerms {
-		dupMaccPerms[k] = v
-	}
-
-	return dupMaccPerms
+	return maps.Clone(maccPerms)
 }
 
 // BlockedAddresses returns all the app's blocked account addresses.