Reinstate claim_admin_fees (Cryptoswap)

[chanhosuh]

Right now this is disabled since it isn't needed for basic sims. Activating this requires some care as this is done in different operations for the 2-coin factory cryptopool and the tricrypto-ng pools.

[allt0ld]

The tricrypto-ng and 2-coin cryptopool implementations of _claim_admin_fees have one main difference. Tricrypto-ng will end execution early (without updating state) if there aren't enough profits to claim. Cryptopool, will, at the very least, still update D and virtual_price even if there aren't enough profits to claim.

[allt0ld]

Another important thing to note: cryptopool calls _claim_admin_fees only in tweak_price, but tricrypto does not. Instead, tricrypto calls _claim_admin_fees in add_liquidity and remove_liquidity_one_coin, both of which also call tweak_price either before or after, and in remove_liquidity, which doesn't need to call tweak_price.