Revert "Torch: only write to sysfs if not already on"

This reverts commit 090cd7927a190091fb7d4e7c334b617252fa8365.

Reverting this patch fixes a bug with flashlight turninng off with screen
on many htc msm8660 devices

Change-Id: Ia1a8317562a1682765fce042de8989d45b39a3b3