removing unused variables (#1719)

* removing unused variables

* undeleting the _

test/token/ERC721/ERC721MintBurn.behavior.js

@@ -4,7 +4,7 @@ const { ZERO_ADDRESS } = constants;
 function shouldBehaveLikeMintAndBurnERC721 (
   creator,
   minter,
-  [owner, newOwner, approved, other]
+  [owner, newOwner, approved]
 ) {
   const firstTokenId = new BN(1);
   const secondTokenId = new BN(2);

test/token/ERC721/ERC721Pausable.test.js

@@ -8,8 +8,6 @@ const ERC721PausableMock = artifacts.require('ERC721PausableMock.sol');
 contract('ERC721Pausable', function ([
   _,
   creator,
-  owner,
-  operator,
   otherPauser,
   ...accounts
 ]) {