Bug 1062798 - Replace custom JSON loaders with LazyLoader.getJSON in Settings App

Replaces custom JSON loaders with the LazyLoader.getJSON helper.
Replaced code in the app permissions, display, help, search and sound panels.
Also replaced within the APN utils module.
I think in this case you could simply revert the change you made and call to `done` directly as it is not required to ensure the behavior of `MockLazyLoader`.