Fix Toxic in switch menu
Show HP shadow during during choice
So we have an HP 'shadow' that appears to show how much HP you've
lost. The change here is that the 'shadow' now updates at the
beginning of the next turn, rather than the end of the current turn.

The main upshot is that you can now see the previous turn's HP and
how much you've lost this turn, while you make your decision for
the next turn.