[backend] Abonnements : pouvoir rechercher par subscription.username

common/models/SubscriptionSearch.php

         $query->andFilterWhere([
             'or',
             ['like', 'user.lastname', $this->username],
-            ['like', 'user.name', $this->username]
+            ['like', 'user.name', $this->username],
+            ['like', 'subscription.username', $this->username]
         ]);
         
         $query->andFilterWhere(['like', 'product.name', $this->product_name]) ;