Fix gantt chart (#79)

Fix moving tasks in Gantt

Start fixing gantt

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/79

src/services/task.js

@@ -95,4 +95,5 @@ export default class TaskService extends AbstractService {
 
 		return model
 	}
-}
+}
+