Delete report success action should redirect to /reports instead of a 404 error on /reports/(report-id)
This is similar to #8638. When I delete a report (which I admit I did accidentally), I get a 404 screen like this: https://www.dropbox.com/s/q6fe2uki7hhotj3/Screenshot%202015-02-19%2010.05.01.png?dl=0 instead of being returned to the reports view.
fixes #9469 - redirect to reports#index on destroy
(cherry picked from commit 0b1dafbbef20e185a9e4fdda626796db4a6168bd)