support for setting validator session keys with a staking proxy

[nicolasochem]

related to #184

Previously it was possible to have a controller in a Ledger and set session keys for a validator. Now I get 'Call nesting not supported' while trying to perform this operation with a staking proxy on a ledger.

Also reported here:

https://forum.polkadot.network/t/staking-controller-deprecation-plan-staking-ui-leads-comms/2748/27?u=nicolasochem

:link: zboto Link

[carlosala]

Which is the exact extrinsic you are submitting?

[nicolasochem]

It's session:setKeys

https://polkadot.js.org/docs/substrate/extrinsics/#setkeyskeys-kitchensinkruntimesessionkeys-proof-bytes

[carlosala]

Thanks for the report! It'll be fixed in next version 👍🏻

[nicolasochem]

it works