fix: use BN from bn.js instead of ethereumjs-util

Author: legobeat

ui/helpers/utils/util.js

@@ -1,7 +1,7 @@
 import punycode from 'punycode/punycode';
 import abi from 'human-standard-token-abi';
 import BigNumber from 'bignumber.js';
-import * as ethUtil from 'ethereumjs-util';
+import BN from 'bn.js';
 import { DateTime } from 'luxon';
 import {
   getFormattedIpfsUrl,
@@ -168,10 +168,10 @@ export function isOriginContractAddress(to, sendTokenAddress) {
 // Takes wei Hex, returns wei BN, even if input is null
 export function numericBalance(balance) {
   if (!balance) {
-    return new ethUtil.BN(0, 16);
+    return new BN(0, 16);
   }
   const stripped = stripHexPrefix(balance);
-  return new ethUtil.BN(stripped, 16);
+  return new BN(stripped, 16);
 }
 
 // Takes  hex, returns [beforeDecimal, afterDecimal]