1. Ipay88 GrabPay fix eWallet Payment returning error.

    - Updated iPay88 dll

2. Fix eWallet refund Merchant slip not showing eWallet type.

3. Remove cover plus checking ewallet  integration.

4. Fix system prompt error message 'Error Communicate with Customer Display.' (using Posiflex brand display pool) when user delete the only scan item. (ticket 126724).