Remove unnecessary blank line in ApiV1DashboardController

Author: EpicFn

src/main/java/org/tuna/zoopzoop/backend/domain/dashboard/controller/ApiV1DashboardController.java

@@ -72,5 +72,4 @@ public ResponseEntity<RsData<BodyForReactFlow>> getGraph(
                         BodyForReactFlow.from(graph)
                 ));
     }
-
 }