Update linting for tests to match src

test/.eslintrc.js

test/__mocks__/audio-buffer-player.js

test/__mocks__/audio-effects.js

test/helpers/intl-helpers.jsx

test/helpers/selenium-helper.js

test/integration/examples.test.js

test/integration/test.js

test/unit/components/button.test.jsx

test/unit/components/icon-button.test.jsx

test/unit/components/sound-editor.test.jsx

test/unit/components/sprite-selector-item.test.jsx

test/unit/containers/green-flag.test.jsx

test/unit/containers/sound-editor.test.jsx

test/unit/containers/sprite-selector-item.test.jsx

test/unit/util/audio-effects.test.js

test/unit/util/audio-util.test.js