[11008] Fix wrong threat assignment in threatAssist().

It may have been faster, but unfortunately made the aggressor threatened by his enemies instead of the opposite...
In case Player heals himself, this is of course pointless as he chooses target himself, hence it had no real effect at all.

src/game/HostileRefManager.cpp

@@ -63,10 +63,7 @@ void HostileRefManager::threatAssist(Unit *pVictim, float pThreat, SpellEntry co
             }
         }
 
-        if (pVictim == getOwner())
-            ref->addThreat(float (threat) / size);          // It is faster to modify the threat durectly if possible
-        else
-            ref->getSource()->addThreat(pVictim, float (threat) / size);
+        ref->getSource()->addThreat(pVictim, float (threat) / size);
 
         ref = ref->next();
     }