Fix Backup Restoration Error

Fix Backup Restoration Error

When running backup from dashboard, after restore is complete the
success message is not dispayed and error `Call to member function
submit() on a non-object` is encountered.

- Change to redirect after successful backup

http://www.concrete5.org/developers/bugs/5-6-2-1/call-to-a-member-function-submit-on-a-non-object-on-backup-datab/