Fix eslint warnings

Since we are about to release it's time to finally fix our linting. This
patch basically runs eslint --fix and does some further manual fixes.
Also it sets up eslint to fail on every warning on order to make
warnings visable in the CI process.

There should no functional change be introduced.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/web/auth/mattermost/index.js

@@ -5,7 +5,7 @@ const passport = require('passport')
 const Mattermost = require('mattermost')
 const OAuthStrategy = require('passport-oauth2').Strategy
 const config = require('../../../config')
-const {setReturnToFromReferer, passportGeneralCallback} = require('../utils')
+const { setReturnToFromReferer, passportGeneralCallback } = require('../utils')
 
 const mattermost = new Mattermost.Client()
 
@@ -24,12 +24,12 @@ mattermostStrategy.userProfile = (accessToken, done) => {
   mattermost.token = accessToken
   mattermost.useHeaderToken()
   mattermost.getMe(
-      (data) => {
-        done(null, data)
-      },
-      (err) => {
-        done(err)
-      }
+    (data) => {
+      done(null, data)
+    },
+    (err) => {
+      done(err)
+    }
   )
 }