Update ledger.py to include manager field otherwise it's ignored

[aorumbayev]

Asset creation in update_accounts overlooked manager field assignment.
This PR simply includes the missing field reference

[aorumbayev]

Also i noticed that something is weird going on in that method,

Aside from this typo. When I have an asset created by contract in innertxn - the manager field clawback and rest are set correctly.

Upon further call from user's wallet to opt-in to that asset (minted by contract) - ledger somehow overwrites the fields in the asset because params dict already contains decoded bytes of the address, and sending encode_address on it again overwrites the manager address.

I'll try to supply an example to replicate the error once i get time

[aorumbayev]

@fergalwalsh perhaps i misunderstood how to do opt-in s for assets in algojig, i was sending an actual asset optin txn and evaluating it with ledger that's what caused weird behaviour - do i need to rely on optin_asset method if i want to do so?

Regardless, I think that manager field should be included