Change Erratic Mana perk stats

[dredknight]

Changes the following aspects of Erratic Mana perk:

• Trigger chance increased from 50% to 100%
• Mana reduction for combat spells changed from 0-50% to 0-30%
• Mana reduction for combat spells changed from 0-50% to 0-30%

https://github.com/Might-Magic-Heroes-5-5/MMH55/blob/master/assembly/patches/MMH55%20production%20patches/erratic_mana.yml