Fix issue #1814 - Reboot DialogInterface

Apply fix from comment #5 by hmorud to correct power off
after cancelling reboot prompt.

1. Hold the power button
2. Choose Reboot
3. Click Cancel
4. Choose Power Off

Phone reboots instead of powering off.

- http://code.google.com/p/cyanogenmod/issues/detail?id=1814

author: hmorud