Clear pin_was_locked_out on reset (bug 1027148)

https://bugzilla.mozilla.org/show_bug.cgi?id=1027148

![clear-was-locked-on-reset-ipod m4v](https://cloud.githubusercontent.com/assets/211578/3321103/bb0d1090-f732-11e3-99d3-8865dc5a930b.gif)