Limit pending reviews (bug 1063172)

https://bugzilla.mozilla.org/show_bug.cgi?id=1063172

1. The pending review check was filtering on approved statuses so you could add your app to the review queue multiple times due to bug number two.
2. When you go to the status page and it sets the anchor to drop you at low-memory devices `window.location = window.location` doesn't refresh the page.
Wondering if we should move these querysets to a method for DRYness. Updating 2 queries each time we make a change is a bit silly. And the cause of bugs when we forget the counting one.