Coins should be spendable after sending a tx, even before it's included into a block

Steps to reproduce:
1. Prepare a wallet for some uncolored BTC and some colored coins (both as single outputs).
2. Send colored coins to some other address.

Expected:
The rest of the colored + uncolored coins not sent in this tx should be spendable immediately.

Actual:
Until the next block, it is not possible to spend any of the coins that participated in the earlier tx.
