Add EventBus connection string to Catalog.API

src/Services/Catalog/Catalog.API/appsettings.json

@@ -17,11 +17,11 @@
     }
   },
   "ConnectionStrings": {
+    "EventBus": "localhost",
     "CatalogDB": ""
   },
   "EventBus": {
     "SubscriptionClientName": "Catalog",
-    "ConnectionString": "localhost",
     "RetryCount": 5
   }
 }