Remove unneeded branch (Firefox stable is now 47, so there's nothing to skip)

Author: marco-c

test/testSelenium.js

@@ -35,16 +35,6 @@
   function runTest(browser, options) {
     options = options ? options : {};
 
-    if (browser.getSeleniumBrowserId() === 'firefox' &&
-      browser.getVersionNumber() < 47) {
-      // There are a range of issues with Marionette and notification permission
-      // acceptance, so tests will only work in 49+
-      console.log('');
-      console.warn(chalk.red('Skipping test since version is < 47'));
-      console.log('');
-      return;
-    }
-
     if (browser.getSeleniumBrowserId() === 'firefox' &&
       process.env.TRAVIS === 'true') {
       console.log('');