Do not apply codestyle to composer autoloaders

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

.pre-commit-config.yaml

@@ -13,5 +13,5 @@ repos:
   - id: php-lint
   - id: php-cs-fixer
     files: \.(php)$
-    exclude: ^(config|data|composer)
+    exclude: ^(config|data|composer|lib\/composer)
     args: []