Fix destination name for 'Fit' zoom levels in hash params

Fixes handling of hash parameters like `#page=0&zoom=Fit`

Actual implementation of fitting was already in `page_view.js`, but incorrect parameter `name: XYZ` was always sent instead of correct Fit* ones.
could you modify this check to the some that will discard invalid FitXXX value? e.g. add array search `ValidZoomValues.indexOf(zoomArgs) >= 0`