Take tagged funds in consideration when moving funds to escrow

We need to take tagged funds in consideration when moving funds to escrow in case where single wallet is being used for PSD and collateral.

```
// MoveFundsToEscrow moves funds from the deal collateral wallet into escrow with
// the storage market actor
func (m *FundManager) MoveFundsToEscrow(ctx context.Context, amt abi.TokenAmount) (cid.Cid, error) {
msgCid, err := m.api.MarketAddBalance(ctx, m.cfg.CollatWallet, m.cfg.StorageMiner, amt)
if err != nil {
return cid.Undef, fmt.Errorf("moving %d to escrow wallet %s: %w", amt, m.cfg.StorageMiner, err)
}

return msgCid, err
}
```

Locate the MoveFundsToEscrow entry point shown in the issue and trace how MarketAddBalance selects funds from the collateral wallet. Reproduce the shared-wallet case for PSD and collateral, then verify that tagged funds are considered when moving the requested amount to escrow.

Written by the indexing model from the issue text.