Remove unused ESM JavaScript file from composer.json

The file `avalynx-datatable.esm.js` was removed from the "files-dev" section of the configuration. This cleans up the project by excluding unused or redundant assets.

Author: jschwind

assetscomposer.json

@@ -7,7 +7,6 @@
   ],
   "files-dev": [
     "src/css/avalynx-datatable.css",
-    "src/js/avalynx-datatable.esm.js",
     "src/js/avalynx-datatable.js"
   ]
 }