Gar's Jala spellpower bonus fixes.

From pull #367: 

True lutes will now give +40 spellpower rather than +30 (equal to a fine lute) as the primary spellpower bonus is no longer bound for Jala (true lutes were already coded to be +40, but were effectively +30 due to this).

Jala's secondary bonus is now based on base max health, rather than max health.