fix musonza#234. getParticipation() return unexpected result musonza#294

Author: Saifallak

src/Services/ConversationService.php

@@ -196,6 +196,6 @@ public function getParticipation($participant = null)
     {
         $participant = $participant ?? $this->participant;
 
-        return $participant->participation()->first();
+        return $participant->participation()->where('conversation_id', $this->conversation->getKey())->first();
     }
 }