Modifications while Voice window is the top window cause a crash

[Meiguro]

Because the voice window is not a Simply/Pebble.js window, it confuses Pebble.js. Change the way windows are managed to check for this.

[andreipopovici]

Not sure if it helps, but crashes happen intermittently now. It may be a race condition, but sometimes it returns to the previous Card window and correctly updates the body, other times it crashes right after dismissing the dictation confirmation window/modal.