[SVN]Escort skill sets mastery to .8 for buyable categories

[Moander]

The most common way for this to happen is probably with the mindstar mastery tree in zigur.

• Get 750 gold, go to Zigur and purchase the Mindstar mastery category. You will get it with a 1.00 mastery

vs

• Save a Alchemist escort and choose the Psiblade talent reward.
• Get 750 gold, go to Zigur and purchase the Mindstar mastery category. You will get it with a 0.80 mastery