Remove reference to ./css.js from npm files list (#5179)

./css.js has been removed with [e093441](e093441#diff-b9cfc7f2cdf78a7f4b91a753d10865a2)

Author: rekomat

package.json

@@ -15,7 +15,6 @@
     "client.js",
     "config.js",
     "constants.js",
-    "css.js",
     "document.js",
     "dynamic.js",
     "error.js",