Stunprod Fix

* Fix icon not updating when turning off baton/stunprod with a total cell charge below the hitcost.
* Baton/stunprod no longer accepts cell with capacity below the hitcost(charge used per stun).
* Removes being able to give one last hit (that doesn't even deduct any charge) when the cell charge gets below the hitcost.
* Adds warning message when baton/stunprod turns off from being out of charge.
Fix
Warning message replaced by sparks sound
Merge pull request #3832 from phil235/StunprodFix

Stunprod Fix