TimerForm: Ensure the enumerator is disposed of in EditLayout()
TimerForm: Ensure the enumerator is disposed of in EditLayout()

Also technically gets rid of undefined behavior as well. If MoveNext()
returns false, the Current property is documented as being in an undefined
state.

Glurmo/LiveSplit,ROMaster2/LiveSplit,ROMaster2/LiveSplit,kugelrund/LiveSplit,Glurmo/LiveSplit,kugelrund/LiveSplit,kugelrund/LiveSplit,ROMaster2/LiveSplit,LiveSplit/LiveSplit,Glurmo/LiveSplit