ci: Ignore assets for PHP-CS-Fixer

The “assets/node_modules” directory now contains some project with PHP files (https://www.npmjs.com/package/flatted), which PHP-CS-Fixer tried to lint.

Let’s ignore the whole “assets” directory since it only includes the client-side files and no PHP should be there.

We can remove the “libs” directory from ignores – we do not use it since we fully switched to Composer.

.php_cs

@@ -1,7 +1,7 @@
 <?php
 
 $finder = PhpCsFixer\Finder::create()
-    ->exclude('libs')
+    ->exclude('assets')
     ->exclude('utils')
     ->in(__DIR__)
     ->name('*.phtml');