Create test for omni_funded_send

[Bushstar]

Please create a test for omni_funded_send including a test to send using omni_funded_send from an address with a single 0.00000546 value UTXO. We want to make sure that the change after the fee is not below the dust threshold or it will be added to the fee, omni_funded_send in 0.6.0 should use the fee address to increase the amount selected if change is below this threshold.