Bug Fix: Stop Pets Fleeing

[Derision]

I started a level 1 necro and noticed my pet started fleeing at low health:

In attack.cpp, at line 1643, changing:

if(damage > 0) {
                //see if we are gunna start fleeing
                CheckFlee();
        }

to

if(damage > 0) {
                //see if we are gunna start fleeing
                if(!IsPet()) CheckFlee();
        }

seems to fix it.