Revert "JellyBam Settings: Disable Low Battery Warning (1/2)"

This reverts commit 870a90e631480d5ac0fd00a9a8f87796f74090bd.
Revert "Temp hack: should fixmissing Tethering preferences"

This reverts commit 56637a0d255be7446efaa348a1db2bf59f6eebdb.
Temp hack: should fixmissing Tethering preferences
BamSettings: Low battery warning policy (2/2)