Remove the 25% failure chance for AI status moves.

[vulcandth]

When the AI uses stat-lowering or status-inflicting moves, like Screech or Sleep Powder, it has an additional 25% chance to fail on top of the usual accuracy and evasion modifiers.

Need to follow this tutorial: https://github.com/pret/pokecrystal/wiki/Remove-the-25%25-failure-chance-for-AI-status-moves
Related to #10