Apply automatic eslint fixes

lib/api/template/tile-template-controller.js

@@ -89,7 +89,7 @@ function getTile ({ tileBackend, label }) {
 }
 
 function setContentTypeHeader () {
-    return function setContentTypeHeaderMiddleware(req, res, next) {
+    return function setContentTypeHeaderMiddleware (req, res, next) {
         res.set('Content-Type', res.get('content-type') || res.get('Content-Type') || 'image/png');
 
         next();