Apply automatic eslint fixes

lib/api/map/tile-layergroup-controller.js

@@ -51,8 +51,8 @@ module.exports = class TileLayergroupController {
         // that performs only the middlewares of the first path that matches
         // for that we use one array to group all paths.
         mapRouter.get([
-            `/:token/:z/:x/:y@:scale_factor?x.:format`, // 1
-            `/:token/:z/:x/:y.:format`, // 2
+            '/:token/:z/:x/:y@:scale_factor?x.:format', // 1
+            '/:token/:z/:x/:y.:format', // 2
             `/:token${not('static')}/:layer/:z/:x/:y.(:format)`
         ], this.middlewares());
     }
@@ -90,7 +90,7 @@ function parseFormat (format = '') {
     return SUPPORTED_FORMATS[prettyFormat] ? prettyFormat : 'invalid';
 }
 
-function getStatusCode(tile, format){
+function getStatusCode (tile, format) {
     return tile.length === 0 && format === 'mvt' ? 204 : 200;
 }
 
@@ -149,9 +149,8 @@ function incrementErrorMetrics (statsClient) {
 
 function tileError () {
     return function tileErrorMiddleware (err, req, res, next) {
-
         // See https://github.com/Vizzuality/Windshaft-cartodb/issues/68
-        let errMsg = err.message ? ( '' + err.message ) : ( '' + err );
+        let errMsg = err.message ? ('' + err.message) : ('' + err);
 
         // Rewrite mapnik parsing errors to start with layer number
         const matches = errMsg.match("(.*) in style 'layer([0-9]+)'");