Fixes the bug that once true, self.sleepLight remains true

The issue occurred by suspending with the light on at least once.
From that moment, every consecutive resume would toggle the light
back on.
Merge pull request #260 from Frenzie/master

Fixes the bug that once true, self.sleepLight remains true
Add workaround for Kobo front light (deprecates KOBO_LIGHT_OFF_ON_SUSPEND)
Merge pull request #261 from Frenzie/master

Add workaround for Kobo front light (deprecates KOBO_LIGHT_OFF_ON_SUSPEN...