Payload packet length check has incorrect error messages

[gjermundgaraba]

The error message for checking the payload list length in packet ValidateBasic is wrongly saying the payloads need to be not empty, when they need to be exactly 1. Fix up this error message to be more accurate.

ibc-go/modules/core/04-channel/v2/types/packet.go

Lines 36 to 38 in cf82eba

	if len(p.Payloads) != 1 {
	return errorsmod.Wrap(ErrInvalidPacket, "payloads must not be empty")
	}

[Sruthi2357]

@gjermundgaraba Can I work on this?

[DimitrisJim]

go for it @Sruthi2357! Please make sure to target the feat/ibc-eureka branch!