Allow changing your vote in delegate election

[sgatewood-da]

If you try to change your ranking under Delegate Election, the submit button is disabled saying your party already submitted

This messed us up because me and another SV didn't coordinate exactly who to put as the leader, so the network stayed down 🥲

[waynecollier-da]

This is in the current UX plan for Digital Asset CN engineering

[julientinguely-da]

Will be solved by delegateless automations