Core/Guild: Fix withdraw money from bank overflowing int32 limit

Clamp amount of money withdrawn from bank to MAX_MONEY_AMOUNT to avoid int32 overflow which would remove money from Player instead of adding it.

src/server/game/Guilds/Guild.cpp

@@ -1762,6 +1762,9 @@ void Guild::HandleMemberDepositMoney(WorldSession* session, uint32 amount)
 
 bool Guild::HandleMemberWithdrawMoney(WorldSession* session, uint32 amount, bool repair)
 {
+    //clamp amount to MAX_MONEY_AMOUNT, Players can't hold more than that anyway
+    amount = std::min(amount, uint32(MAX_MONEY_AMOUNT));
+    
     if (m_bankMoney < amount)                               // Not enough money in bank
         return false;