Removed duplicate update check error hanlindg

refs https://github.com/TryGhost/Team/issues/726

- Update check service is self contained and handles errors through logging internally. There is no visible upside to do the same logging in multiple places

core/server/web/admin/controller.js

@@ -2,7 +2,6 @@ const debug = require('ghost-ignition').debug('web:admin:controller');
 const path = require('path');
 const config = require('../../../shared/config');
 const updateCheck = require('../../update-check');
-const logging = require('../../../shared/logging');
 
 /**
  * @description Admin controller to handle /ghost/ requests.
@@ -16,10 +15,7 @@ module.exports = function adminController(req, res) {
     debug('index called');
 
     // CASE: trigger update check unit and let it run in background, don't block the admin rendering
-    updateCheck()
-        .catch((err) => {
-            logging.error(err);
-        });
+    updateCheck();
 
     const defaultTemplate = config.get('env') === 'production' ? 'default-prod.html' : 'default.html';
     const templatePath = path.resolve(config.get('paths').adminViews, defaultTemplate);