Residual PoS inflation to PGF

[grarco]

Currently the residual, undistributed amount of PoS inflation is distributed to the Governance address. It's probably better if we distributed this amount to PGF instead so that it can be later spent.

For reference: @batconjurer, @cwgoes, @Fraccaman, @brentstone

[cwgoes]

What do you mean by "residual/undistributed" - do you mean unclaimed? Or not possible to claim?

[brentstone]

Check proof_of_stake::rewards::update_rewards_products_and_mint_inflation, due to Dec computations, sometimes there is some dust remaining from the inflation minted after distributing the proper shares to each validator. This dust amount is currently sent to the Gov address.

[cwgoes]

I see. I think that dust amount can be sent to PGF instead, yes.