recovery: Do not "return TOGGLE" when home key is pressed

Press the home key returns "TOGGLE", this behaviour conflicts with the regular home key handling, that is the home key doesn't work as selection key.
Change-Id: Ic1ae27304aa939e2c8db242121afd43d28d3aa9e
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android_bootable_recovery into mkl