Fizzles Minimum Reduction

Currently players can never get below a 5% fizzle rate, even at max
spellpower. This might be the most common player complaint of all time.
This change reduces the minimum fizzle rate to 1% at max spellpower.

Looking at the code, the max success chance was capped by a lone bound.
It's easy to miss or overlook, so I'm sure multiple administrations never
even thought about it, but that single digit has been annoying and frustrating
people for 15 years. Let's end the madness.

99 spellpower = 99 success chance!