Fix SLP balancesForAddressSingle() integration test

[christroutner]

The integration test for the balancesForAddressSingle() function in the SLP library is failing because the address it uses for the test have no no tokens. This is the address:

slptest:pz0qcslrqn7hr44hsszwl4lw5r6udkg6zqv7sq3kk7

The scope of this task is to:

• Create a new wallet and send it a new SLP token
• Replace the current address with the new address in the balancesForAddressSingle() integration test.
• Destroy the wallet so the token will never be spent.

I am funding the above address with a token to keep the test functioning until it can be fixed. I have no way to know when/if the token will be spent.