Include Back identifier and send along event

Older webOS versions use the Back keyIdentifier which was missed
before. The key event is send along so any event handler can use
stopPropagation and preventDefault functions of the event object.

I tested on a Pre3 which indeed used the "Back" keyIdentifier. Alternatively, keyCode could be used instead of keyIdentifier. Both ESC on desktops as the "Back" event use keyCode 27. I decided to stay in line with the use of a keyIdentifier.

The change to ServiceRequest is just a fixed typo which trips a browser.