ics29: not possible to use relayer address as payee after setting a payee address

[crodriguezvega]

Thanks to @ljoss17 for reporting this issue!

Summary of Bug

Once MsgRegisterPayee is used to register a payee for a relayer it is not possible to revert back to using the relayer address as payee. Validation of the message currently makes it impossible to either set the payee address to the same as the relayer address, or set the payee to an empty string.

Expected Behaviour

Be able to use the relayer address as payee if I don't want to use a payee address set before.

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For Admin Use

• Not duplicate issue
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[chandiniv1]

@crodriguezvega do I need to change validations or anything else

[crodriguezvega]

Thank you, @chandiniv1. I think removing the check msg.Relayer == msg.Payee (and any related tests) should be enough, so that a relayer can use its own address as payee if they wish to.