Dashboards: Misinformation message when user deletes dashboards

User with the Manager permissions for the specific Dashboard, can't delete the dashboard. But receives misinformation, first error message and then that dashboard successfully deleted

## Expected Behavior
Don't show Delete button for user with manager permissions, if they are not able to delete dashboard

## Current Behavior
Delete button is available, when user click on it, first error occurs and then that dashboard is successfully deleted.


## Steps to Reproduce (for bugs)
1. Create 2 users with non-admin roles
2. With User 1 go to Dashboards
3. Create a dashboard
4. Share it with User 2, with Manager permissions
5. Login with User 2
6. Go to Dashboards
7. Click More -> Delete

## Your Environment
* Graylog Version: latest master
* Java Version:
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version: