remove sinon and duplicate use for chaiEnzyme

Author: =

tests/stylized/ListStyle.js

@@ -6,13 +6,10 @@ import Adapter from 'enzyme-adapter-react-16'
 
 import chai, { expect } from 'chai'
 import chaiEnzyme from 'chai-enzyme'
-import sinon from 'sinon'
 
 Enzyme.configure({ adapter: new Adapter() })
 chai.use(chaiEnzyme())
 
-chai.use(chaiEnzyme())
-
 import ListStyle from '../../src/stylized/ListStyle'
 
 describe('<ListStyle />', () => {