Revert "apply rector rules for exports"

This reverts commit 3adf3625

src/Bundle/ChillActivityBundle/Export/Aggregator/ActivityUsersAggregator.php

@@ -56,10 +56,6 @@ class ActivityUsersAggregator implements AggregatorInterface
     {
         // nothing to add on the form
     }
-    public function getFormDefaultData(): array
-    {
-        return [];
-    }
 
     public function getLabels($key, array $values, $data)
     {