[MINOR] Futurepass `register_delegate` can be used to add a proxy to an EOA account

[surangap]

pub fn register_delegate_with_signature(
			origin: OriginFor<T>,
			futurepass: T::AccountId,
			delegate: T::AccountId,
			proxy_type: T::ProxyType,
			deadline: u32,
			signature: [u8; 65],
		)

if caller and futurepass params are the same, the function will run though and add the delegate as a proxy of futurepass
This is a minor/no impact since it can only be used for EOA accounts. Users cannot sign and send as a futurepass.