Remove the need to supply proposer reward address on genesis

As rollapp operators won't necessarily know the relevant sequencer reward address ,on start we need to remove this requirement.

// InitGenesis initializes the sequencers module's state from a provided genesis state.
// We return the for ValidatorUpdate only the sequencers set by dymint
func (k *Keeper) InitGenesis(ctx sdk.Context, genState types.GenesisState) []abci.ValidatorUpdate {
    var updates []abci.ValidatorUpdate
    k.SetParams(ctx, genState.Params)

    operatorAddr, err := sdk.ValAddressFromBech32(genState.GenesisOperatorAddress)
    if err != nil {
        panic(err)
    }

This can be provided later using the create sequencer tx

dymensionxyz / dymension-rdk

Remove the need to supply proposer reward address on genesis #509