Fix uninitialized member

lib/rewardable/Reward.cpp

@@ -33,6 +33,7 @@ Rewardable::Reward::Reward()
 	, heroLevel(0)
 	, manaDiff(0)
 	, manaPercentage(-1)
+	, manaOverflowFactor(0)
 	, movePoints(0)
 	, movePercentage(-1)
 	, primary(4, 0)