Redirect on MyWork page after PBC import

Per story [60365444](https://www.pivotaltracker.com/story/show/60365444).  Makes it so that PBC request imports from the MyWork page go back to the MyWork rather than program page. Uses the same technique as was used to get this functionality 

An orthogonal JS change had to be made: a regex condition, intended for an unrelated circumstance, was being triggered by the redirect path being placed inside a query string (as is the usual approach for remember where the user started the import).  This caused an error, and is fixed by having `assets/javascripts/apps/dashboard.js` only check for `/dashboard` at the very start of the url path.