Fixed clone damage

lib/CStack.cpp

@@ -201,6 +201,7 @@ void CStack::prepareAttacked(BattleStackAttacked & bsa, vstd::RNG & rand, std::s
 {
 	auto initialCount = customState->getCount();
 
+	// compute damage and update bsa.damageAmount
 	customState->damage(bsa.damageAmount);
 
 	bsa.killedAmount = initialCount - customState->getCount();

lib/battle/CUnitState.cpp

@@ -823,7 +823,7 @@ void CUnitState::damage(int64_t & amount)
 		// block ability should not kill clone (0 damage)
 		if(amount > 0)
 		{
-			amount = 1;//TODO: what should be actual damage against clone?
+			amount = 0;
 			health.reset();
 		}
 	}