fix GroupDelete

Co-Authored-By: Talha Caliskan <killerber4t@users.noreply.github.com>

src/main/java/mops/gruppen2/config/Gruppen2Config.java

@@ -8,8 +8,11 @@ import org.springframework.context.annotation.Configuration;
 @Configuration
 public class Gruppen2Config {
 
-    @Autowired
-    GroupService groupService;
-    @Autowired
-    EventService eventService;
+    final GroupService groupService;
+    final EventService eventService;
+
+    public Gruppen2Config(GroupService groupService, EventService eventService) {
+        this.groupService = groupService;
+        this.eventService = eventService;
+    }
 }