postcss.config.js: remove arrow return (#32235)

build/postcss.config.js

@@ -1,14 +1,18 @@
 'use strict'
 
-module.exports = ctx => ({
+module.exports = ctx => {
-  map: ctx.file.dirname.includes('examples') ? false : {
+  return {
-    inline: false,
+    map: ctx.file.dirname.includes('examples') ?
-    annotation: true,
+      false :
-    sourcesContent: true
+      {
-  },
+        inline: false,
-  plugins: {
+        annotation: true,
-    autoprefixer: {
+        sourcesContent: true
-      cascade: false
+      },
+    plugins: {
+      autoprefixer: {
+        cascade: false
+      }
     }
   }
-})
+}