update nightwatch version to 3.0.1, remove w3c flag from nightwatch config

• Update Nightwatch version to 3.0.1
• Remove w3c flag from nightwatch.conf.js (this flag has been removed from recent chrome drivers)

TODO:

• check if all tests are passing
• fix failing tests

core/tests/Drupal/Nightwatch/nightwatch.conf.js

@@ -67,7 +67,6 @@ module.exports = {
         browserName: 'chrome',
         acceptSslCerts: true,
         'goog:chromeOptions': {
-          w3c: false,
           args: process.env.DRUPAL_TEST_WEBDRIVER_CHROME_ARGS
             ? process.env.DRUPAL_TEST_WEBDRIVER_CHROME_ARGS.split(' ')
             : [],
@@ -94,7 +93,6 @@ module.exports = {
         browserName: 'chrome',
         acceptSslCerts: true,
         'goog:chromeOptions': {
-          w3c: false,
           args: process.env.DRUPAL_TEST_WEBDRIVER_CHROME_ARGS
             ? process.env.DRUPAL_TEST_WEBDRIVER_CHROME_ARGS.split(' ')
             : [],